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#1
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epoxy not setting up
Is there anything I can do now. It is just sort of sticky.
Thanks. Bill |
#2
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If it's been mixed off-ratio, it'll never set up.
To take a last quick test, scrape a small gob off the patient, subject it to the heat of a heat gun ot heatlamp for ten minutes or so. If it still hasn't solidified, the gooey stuff has got to come off. In order, i'd try: - white vinegar and a coarse metal pot scrubber - white vinegar and a scotchbrite grill scrubber - acetone and the pot scrubber - prayer - many coarse sanding disks .. "Bill" wrote in message ... Is there anything I can do now. It is just sort of sticky. Thanks. Bill |
#3
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If it has been mixed with hardener it should setup eventually. Heat and time
will eventually harden the mix. The more heat (up to a point) the less time. I miscalculated the mix ratio on a batch I used for a repair patch last year. It was very sticky for a long time, then after several weeks in the hot sun it eventually cured. "Bill" wrote in message ... Is there anything I can do now. It is just sort of sticky. Thanks. Bill |
#4
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Yeah but ...given the time of year, it could be nothing more than shop temperature biting him. The original poster didn't say. I'd vote for some incandescent shop lamps or other heat source focused on the sticky epoxy to warm it up to 70 F or so for a day or two, then decide if it's going to cure. Every epoxy in the book will cure hard to touch within 24 hours at 70 F, so if it's still sticky after that ...sigh, then I'd remove it and try again. Brian D "Sail-n-Dive" wrote in message ... Epoxy is not catalyzed ( i.e., no "hardener" is mixed at all) like many other plastics and the correct amount of each part of the components must be there for the "curing" to take place. If will have to come back off if it was not properly mixed. "Paul Winchester" wrote in message ... If it has been mixed with hardener it should setup eventually. Heat and time will eventually harden the mix. The more heat (up to a point) the less time. I miscalculated the mix ratio on a batch I used for a repair patch last year. It was very sticky for a long time, then after several weeks in the hot sun it eventually cured. "Bill" wrote in message ... Is there anything I can do now. It is just sort of sticky. Thanks. Bill |
#5
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Yup, Brian is right.. A lot of epoxy will "activate" (get pretty hard)
down to the high 30's (F), but will never really finish off until it gets a good 24 hours at above 70-75 degrees F. Because epoxy is itself overkill for most of what we do with it, for practical purposes, we can call it "cured" even before that heat period and final cure, the overkill is also what makes it possible for almost anyone to build a boat. To the origional poster, build a small tent, in a garage or something if you can, and put a couple of incadecent light bulbs in there overnight, you will probably be pleaseantly surprised. Don't go overboard, 75F is plenty and in this case, higher temps are not necessarily "better". Be cautious of fire hazard of course. I crank up a 65,000BTU furnace in the 12 x 20 shed, more overkill, try the light bulbs Good luck. |
#6
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Bill wrote: Is there anything I can do now. It is just sort of sticky. Thanks. Bill Wash out with a solvent, as others have suggested, of course; but I thought you might be interested in this experience. A coat of epoxy on the interior of a Goodboad failed to cure, but not from wrong mixing ratio. As Kern Hendricks of System Three determined with me over the phone, it was from an unvented kerosene heater being used to heat the closed shop when the furnace was broken down. Kern figured that the CO was reacting with the hardener, I think; no chemist I. |
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