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#22
posted to rec.boats.building
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Remove or Not Remove Partially Cured Epoxy?
Yesterday, I checked the epoxy, and I found that it was noticably more
solid than two or three days ago. I have a feeling that it will eventually cure completely -- just very slowly. I have contacted the tech support of the epoxy manufacturer. He said that the epoxy mostly likely will eventually cure because of the fact that the curing is progressing. More importantly, he also said that the cured epoxy will have a good bond despite the fact that the epoxy will take much longer time to cure than normal. Therefore, I will wait a couple weeks for epoxy to cure completely. Jay Chan Mik wrote: If I was you, I'd wait a couple of weeks til it seems to harden as much as possible. Then, I'd start scraping. Sicne it hasn't cured properly, you can try a heat gun to soften up the epoxy before scraping. Paint scrapers, window scrapers, utility knives, 40 grit sandpaper. Try everything, except a garden rake.... Seriously. Especially since this is structural, I'd be removing all of the epoxy, down to bare wood, and starting over. cured epoxy is fantastic, but partially cured is a disaster waiting to happen. Why ruin a good boat over some bad epoxy?? Mike Saskatoon, SK wrote: Thanks for pointing this out. Sound like I have a hopeless case on my hand. OK, I just have to treat it as a learning experience. Jay Chan derbyrm wrote: I think there's some confusion between polyester resin and epoxy. As someone else pointed out, with polyester, the hardener is a catalyst/accelerator and the resin will eventually cure. As I understand epoxy, it is the combination of the chemicals in the resin and those in the hardener. Too few of the hardener molecules and you'll never end up with actual epoxy, only with a slurry of cured epoxy and uncured resin molecules looking for their mates. It will not be very strong. I'd suggest you start scraping. Roger (sorry) http://home.insightbb.com/~derbyrm wrote in message groups.com... Glad to hear that there is some hope. OK, I will wait a week or two to give it a chance. Meanwhile, I can always work on something else or go fishing on a rental boat. If after two weeks my finger nail still can make a dent on the epoxy, I will remove it. |
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#23
posted to rec.boats.building
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Remove or Not Remove Partially Cured Epoxy?
Now, this is 22 days after I put the epoxy in place. The epoxy is
definitely more solid than on late June. I feel safe to have my hope high. The epoxy is curing very slowly. Luckily, I am working on mounting an air conditioner next to my boat; therefore, time is not wasted. Jay Chan wrote: Yesterday, I checked the epoxy, and I found that it was noticably more solid than two or three days ago. I have a feeling that it will eventually cure completely -- just very slowly. I have contacted the tech support of the epoxy manufacturer. He said that the epoxy mostly likely will eventually cure because of the fact that the curing is progressing. More importantly, he also said that the cured epoxy will have a good bond despite the fact that the epoxy will take much longer time to cure than normal. Therefore, I will wait a couple weeks for epoxy to cure completely. Jay Chan Mik wrote: If I was you, I'd wait a couple of weeks til it seems to harden as much as possible. Then, I'd start scraping. Sicne it hasn't cured properly, you can try a heat gun to soften up the epoxy before scraping. Paint scrapers, window scrapers, utility knives, 40 grit sandpaper. Try everything, except a garden rake.... Seriously. Especially since this is structural, I'd be removing all of the epoxy, down to bare wood, and starting over. cured epoxy is fantastic, but partially cured is a disaster waiting to happen. Why ruin a good boat over some bad epoxy?? Mike Saskatoon, SK wrote: Thanks for pointing this out. Sound like I have a hopeless case on my hand. OK, I just have to treat it as a learning experience. Jay Chan derbyrm wrote: I think there's some confusion between polyester resin and epoxy. As someone else pointed out, with polyester, the hardener is a catalyst/accelerator and the resin will eventually cure. As I understand epoxy, it is the combination of the chemicals in the resin and those in the hardener. Too few of the hardener molecules and you'll never end up with actual epoxy, only with a slurry of cured epoxy and uncured resin molecules looking for their mates. It will not be very strong. I'd suggest you start scraping. Roger (sorry) http://home.insightbb.com/~derbyrm wrote in message groups.com... Glad to hear that there is some hope. OK, I will wait a week or two to give it a chance. Meanwhile, I can always work on something else or go fishing on a rental boat. If after two weeks my finger nail still can make a dent on the epoxy, I will remove it. |
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#24
posted to rec.boats.building
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Remove or Not Remove Partially Cured Epoxy?
Actually, I counted the number of days wrong. I should have said that
now is 32 days (instead of 22 days) after I put the epoxy in place. Jay Chan wrote: Now, this is 22 days after I put the epoxy in place. The epoxy is definitely more solid than on late June. I feel safe to have my hope high. The epoxy is curing very slowly. Luckily, I am working on mounting an air conditioner next to my boat; therefore, time is not wasted. Jay Chan wrote: Yesterday, I checked the epoxy, and I found that it was noticably more solid than two or three days ago. I have a feeling that it will eventually cure completely -- just very slowly. I have contacted the tech support of the epoxy manufacturer. He said that the epoxy mostly likely will eventually cure because of the fact that the curing is progressing. More importantly, he also said that the cured epoxy will have a good bond despite the fact that the epoxy will take much longer time to cure than normal. Therefore, I will wait a couple weeks for epoxy to cure completely. Jay Chan Mik wrote: If I was you, I'd wait a couple of weeks til it seems to harden as much as possible. Then, I'd start scraping. Sicne it hasn't cured properly, you can try a heat gun to soften up the epoxy before scraping. Paint scrapers, window scrapers, utility knives, 40 grit sandpaper. Try everything, except a garden rake.... Seriously. Especially since this is structural, I'd be removing all of the epoxy, down to bare wood, and starting over. cured epoxy is fantastic, but partially cured is a disaster waiting to happen. Why ruin a good boat over some bad epoxy?? Mike Saskatoon, SK wrote: Thanks for pointing this out. Sound like I have a hopeless case on my hand. OK, I just have to treat it as a learning experience. Jay Chan derbyrm wrote: I think there's some confusion between polyester resin and epoxy. As someone else pointed out, with polyester, the hardener is a catalyst/accelerator and the resin will eventually cure. As I understand epoxy, it is the combination of the chemicals in the resin and those in the hardener. Too few of the hardener molecules and you'll never end up with actual epoxy, only with a slurry of cured epoxy and uncured resin molecules looking for their mates. It will not be very strong. I'd suggest you start scraping. Roger (sorry) http://home.insightbb.com/~derbyrm wrote in message groups.com... Glad to hear that there is some hope. OK, I will wait a week or two to give it a chance. Meanwhile, I can always work on something else or go fishing on a rental boat. If after two weeks my finger nail still can make a dent on the epoxy, I will remove it. |
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#25
posted to rec.boats.building
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Remove or Not Remove Partially Cured Epoxy?
After 45 days since I put the epoxy in place, the epoxy has _finally_
cured completely. Seem like those two very hot days in the beginning of this week really helped the curing process. The outdoor temperature of those two days was 97 degree+, and the temperatur inside the boat cover probably was above 110 degree. Just try to let people know in case someone runs into the same situation as I was. Then he can decide whether he really wants to wait that long for the epoxy to cure, whether he should expect his local weather will help or hurt the curing process, and whether he should work on something else while he is waiting for the epoxy to cure. Jay Chan wrote: Actually, I counted the number of days wrong. I should have said that now is 32 days (instead of 22 days) after I put the epoxy in place. Jay Chan wrote: Now, this is 22 days after I put the epoxy in place. The epoxy is definitely more solid than on late June. I feel safe to have my hope high. The epoxy is curing very slowly. Luckily, I am working on mounting an air conditioner next to my boat; therefore, time is not wasted. Jay Chan wrote: Yesterday, I checked the epoxy, and I found that it was noticably more solid than two or three days ago. I have a feeling that it will eventually cure completely -- just very slowly. I have contacted the tech support of the epoxy manufacturer. He said that the epoxy mostly likely will eventually cure because of the fact that the curing is progressing. More importantly, he also said that the cured epoxy will have a good bond despite the fact that the epoxy will take much longer time to cure than normal. Therefore, I will wait a couple weeks for epoxy to cure completely. Jay Chan Mik wrote: If I was you, I'd wait a couple of weeks til it seems to harden as much as possible. Then, I'd start scraping. Sicne it hasn't cured properly, you can try a heat gun to soften up the epoxy before scraping. Paint scrapers, window scrapers, utility knives, 40 grit sandpaper. Try everything, except a garden rake.... Seriously. Especially since this is structural, I'd be removing all of the epoxy, down to bare wood, and starting over. cured epoxy is fantastic, but partially cured is a disaster waiting to happen. Why ruin a good boat over some bad epoxy?? Mike Saskatoon, SK wrote: Thanks for pointing this out. Sound like I have a hopeless case on my hand. OK, I just have to treat it as a learning experience. Jay Chan derbyrm wrote: I think there's some confusion between polyester resin and epoxy. As someone else pointed out, with polyester, the hardener is a catalyst/accelerator and the resin will eventually cure. As I understand epoxy, it is the combination of the chemicals in the resin and those in the hardener. Too few of the hardener molecules and you'll never end up with actual epoxy, only with a slurry of cured epoxy and uncured resin molecules looking for their mates. It will not be very strong. I'd suggest you start scraping. Roger (sorry) http://home.insightbb.com/~derbyrm wrote in message groups.com... Glad to hear that there is some hope. OK, I will wait a week or two to give it a chance. Meanwhile, I can always work on something else or go fishing on a rental boat. If after two weeks my finger nail still can make a dent on the epoxy, I will remove it. |
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#26
posted to rec.boats.building
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Remove or Not Remove Partially Cured Epoxy?
Jaykchan-
Unless you have done some tensile tests on your epoxy, and have found that its strength equals the manufacturer's published figures, your statement that it has cured "completely" is unfounded. Further, it is the height of irresponsibility to suggest that others listening here might rely on the approach you've taken. In my view, you've rolled the dice and whether your boat holds together remains to be seen. Please don't suggest that others take the same risk. Lives could be at stake. wrote in message oups.com... After 45 days since I put the epoxy in place, the epoxy has _finally_ cured completely. Seem like those two very hot days in the beginning of this week really helped the curing process. The outdoor temperature of those two days was 97 degree+, and the temperatur inside the boat cover probably was above 110 degree. Just try to let people know in case someone runs into the same situation as I was. Then he can decide whether he really wants to wait that long for the epoxy to cure, whether he should expect his local weather will help or hurt the curing process, and whether he should work on something else while he is waiting for the epoxy to cure. Jay Chan wrote: Actually, I counted the number of days wrong. I should have said that now is 32 days (instead of 22 days) after I put the epoxy in place. Jay Chan wrote: Now, this is 22 days after I put the epoxy in place. The epoxy is definitely more solid than on late June. I feel safe to have my hope high. The epoxy is curing very slowly. Luckily, I am working on mounting an air conditioner next to my boat; therefore, time is not wasted. Jay Chan wrote: Yesterday, I checked the epoxy, and I found that it was noticably more solid than two or three days ago. I have a feeling that it will eventually cure completely -- just very slowly. I have contacted the tech support of the epoxy manufacturer. He said that the epoxy mostly likely will eventually cure because of the fact that the curing is progressing. More importantly, he also said that the cured epoxy will have a good bond despite the fact that the epoxy will take much longer time to cure than normal. Therefore, I will wait a couple weeks for epoxy to cure completely. Jay Chan Mik wrote: If I was you, I'd wait a couple of weeks til it seems to harden as much as possible. Then, I'd start scraping. Sicne it hasn't cured properly, you can try a heat gun to soften up the epoxy before scraping. Paint scrapers, window scrapers, utility knives, 40 grit sandpaper. Try everything, except a garden rake.... Seriously. Especially since this is structural, I'd be removing all of the epoxy, down to bare wood, and starting over. cured epoxy is fantastic, but partially cured is a disaster waiting to happen. Why ruin a good boat over some bad epoxy?? Mike Saskatoon, SK wrote: Thanks for pointing this out. Sound like I have a hopeless case on my hand. OK, I just have to treat it as a learning experience. Jay Chan derbyrm wrote: I think there's some confusion between polyester resin and epoxy. As someone else pointed out, with polyester, the hardener is a catalyst/accelerator and the resin will eventually cure. As I understand epoxy, it is the combination of the chemicals in the resin and those in the hardener. Too few of the hardener molecules and you'll never end up with actual epoxy, only with a slurry of cured epoxy and uncured resin molecules looking for their mates. It will not be very strong. I'd suggest you start scraping. Roger (sorry) http://home.insightbb.com/~derbyrm wrote in message groups.com... Glad to hear that there is some hope. OK, I will wait a week or two to give it a chance. Meanwhile, I can always work on something else or go fishing on a rental boat. If after two weeks my finger nail still can make a dent on the epoxy, I will remove it. |
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#27
posted to rec.boats.building
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Remove or Not Remove Partially Cured Epoxy?
You're a patient man, Jay! I've been following along as things have
progressed and am very glad to hear that your epoxy finally made the mark. Note that even properly mixed epoxy takes something like 2 months or longer to reach full strength, approaching the mark in an asymptotic way ...90% of the strength within a few days, 100% of the strength in a couple of months. But either way, glad to hear of your good results! Brian wrote in message oups.com... After 45 days since I put the epoxy in place, the epoxy has _finally_ cured completely. Seem like those two very hot days in the beginning of this week really helped the curing process. The outdoor temperature of those two days was 97 degree+, and the temperatur inside the boat cover probably was above 110 degree. Just try to let people know in case someone runs into the same situation as I was. Then he can decide whether he really wants to wait that long for the epoxy to cure, whether he should expect his local weather will help or hurt the curing process, and whether he should work on something else while he is waiting for the epoxy to cure. Jay Chan wrote: Actually, I counted the number of days wrong. I should have said that now is 32 days (instead of 22 days) after I put the epoxy in place. Jay Chan wrote: Now, this is 22 days after I put the epoxy in place. The epoxy is definitely more solid than on late June. I feel safe to have my hope high. The epoxy is curing very slowly. Luckily, I am working on mounting an air conditioner next to my boat; therefore, time is not wasted. Jay Chan wrote: Yesterday, I checked the epoxy, and I found that it was noticably more solid than two or three days ago. I have a feeling that it will eventually cure completely -- just very slowly. I have contacted the tech support of the epoxy manufacturer. He said that the epoxy mostly likely will eventually cure because of the fact that the curing is progressing. More importantly, he also said that the cured epoxy will have a good bond despite the fact that the epoxy will take much longer time to cure than normal. Therefore, I will wait a couple weeks for epoxy to cure completely. Jay Chan Mik wrote: If I was you, I'd wait a couple of weeks til it seems to harden as much as possible. Then, I'd start scraping. Sicne it hasn't cured properly, you can try a heat gun to soften up the epoxy before scraping. Paint scrapers, window scrapers, utility knives, 40 grit sandpaper. Try everything, except a garden rake.... Seriously. Especially since this is structural, I'd be removing all of the epoxy, down to bare wood, and starting over. cured epoxy is fantastic, but partially cured is a disaster waiting to happen. Why ruin a good boat over some bad epoxy?? Mike Saskatoon, SK wrote: Thanks for pointing this out. Sound like I have a hopeless case on my hand. OK, I just have to treat it as a learning experience. Jay Chan derbyrm wrote: I think there's some confusion between polyester resin and epoxy. As someone else pointed out, with polyester, the hardener is a catalyst/accelerator and the resin will eventually cure. As I understand epoxy, it is the combination of the chemicals in the resin and those in the hardener. Too few of the hardener molecules and you'll never end up with actual epoxy, only with a slurry of cured epoxy and uncured resin molecules looking for their mates. It will not be very strong. I'd suggest you start scraping. Roger (sorry) http://home.insightbb.com/~derbyrm wrote in message groups.com... Glad to hear that there is some hope. OK, I will wait a week or two to give it a chance. Meanwhile, I can always work on something else or go fishing on a rental boat. If after two weeks my finger nail still can make a dent on the epoxy, I will remove it. |
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#28
posted to rec.boats.building
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Remove or Not Remove Partially Cured Epoxy?
Thanks for reminding me that the epoxy will not reach full strength for
months to come. I will go easy on the area. From the slow pace that I have been working on the boat, I doubt there will be a lot of people standing on the deck any time soon. Oh well... Jay Chan Brian D wrote: You're a patient man, Jay! I've been following along as things have progressed and am very glad to hear that your epoxy finally made the mark. Note that even properly mixed epoxy takes something like 2 months or longer to reach full strength, approaching the mark in an asymptotic way ...90% of the strength within a few days, 100% of the strength in a couple of months. But either way, glad to hear of your good results! Brian wrote in message oups.com... After 45 days since I put the epoxy in place, the epoxy has _finally_ cured completely. Seem like those two very hot days in the beginning of this week really helped the curing process. The outdoor temperature of those two days was 97 degree+, and the temperatur inside the boat cover probably was above 110 degree. Just try to let people know in case someone runs into the same situation as I was. Then he can decide whether he really wants to wait that long for the epoxy to cure, whether he should expect his local weather will help or hurt the curing process, and whether he should work on something else while he is waiting for the epoxy to cure. Jay Chan wrote: Actually, I counted the number of days wrong. I should have said that now is 32 days (instead of 22 days) after I put the epoxy in place. Jay Chan wrote: Now, this is 22 days after I put the epoxy in place. The epoxy is definitely more solid than on late June. I feel safe to have my hope high. The epoxy is curing very slowly. Luckily, I am working on mounting an air conditioner next to my boat; therefore, time is not wasted. Jay Chan wrote: Yesterday, I checked the epoxy, and I found that it was noticably more solid than two or three days ago. I have a feeling that it will eventually cure completely -- just very slowly. I have contacted the tech support of the epoxy manufacturer. He said that the epoxy mostly likely will eventually cure because of the fact that the curing is progressing. More importantly, he also said that the cured epoxy will have a good bond despite the fact that the epoxy will take much longer time to cure than normal. Therefore, I will wait a couple weeks for epoxy to cure completely. Jay Chan Mik wrote: If I was you, I'd wait a couple of weeks til it seems to harden as much as possible. Then, I'd start scraping. Sicne it hasn't cured properly, you can try a heat gun to soften up the epoxy before scraping. Paint scrapers, window scrapers, utility knives, 40 grit sandpaper. Try everything, except a garden rake.... Seriously. Especially since this is structural, I'd be removing all of the epoxy, down to bare wood, and starting over. cured epoxy is fantastic, but partially cured is a disaster waiting to happen. Why ruin a good boat over some bad epoxy?? Mike Saskatoon, SK wrote: Thanks for pointing this out. Sound like I have a hopeless case on my hand. OK, I just have to treat it as a learning experience. Jay Chan derbyrm wrote: I think there's some confusion between polyester resin and epoxy. As someone else pointed out, with polyester, the hardener is a catalyst/accelerator and the resin will eventually cure. As I understand epoxy, it is the combination of the chemicals in the resin and those in the hardener. Too few of the hardener molecules and you'll never end up with actual epoxy, only with a slurry of cured epoxy and uncured resin molecules looking for their mates. It will not be very strong. I'd suggest you start scraping. Roger (sorry) http://home.insightbb.com/~derbyrm wrote in message groups.com... Glad to hear that there is some hope. OK, I will wait a week or two to give it a chance. Meanwhile, I can always work on something else or go fishing on a rental boat. If after two weeks my finger nail still can make a dent on the epoxy, I will remove it. |
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