Home |
Search |
Today's Posts |
#7
|
|||
|
|||
Polyester or Epoxy?
BruceM wrote:
As one who has need for some poly glassing I have often thought there should be another news group for "ordinary" people. My whole boat is poly so why do some alterations in epoxy? And be chained to epoxy therever after? When I moved the head intake aboard my "The Penny Louise" HR28 sloop to make room for monkey feet under the new saloon booth table decoratif, I used a one piece 3/8" solid plug of poly glass tapered to fit the ground out hole, pressed between thin plywoods lined with waxed paper. It never even needed sanding after it cured. After vandals burned my boat, while the insurance swindler was viewing the wreckage, I bashed in the speedo sensor to allow the water to drain. We came back after a few beers so he could check out the remains of the hull interior (?) I paid for the lunch. It seems to me now that I could have tried to bash in the 3 year old patch, but I didn't think of it then. After this long, I think that the cradle, hull, engine, gas fuel tank, boom, ballast, shaft and rudder were useable, (I had just re-glassed the shaft log using epoxy), I just didn't have the heart to rebuild. After a year of arguing with Parizeau et bureau legal d'assurance, I accepted 14,500 and carriage for a boat that was insured and not replaceable for 18,500, it's purchase price. I maintain perfect faith that it would have been one hell of a job to bash in that plug. Wanna buy a 2 cylinder, 2 cycle gas 20 hp Lloyds Mariner (German) inboard with electric start, reverser, shaft and prop? It did well on the 'penile ooies', as we called her. Terry K BruceM "Terry Spragg" wrote in message ... Michael O'Dell wrote: In article , "Allan" wrote: Hi. I'll probably get some thoughts on this. I built a 20' Osprey Triple kayak using epoxy resin. Nice boat. Now I'm building an 18' Trident Power Cat ( johnsboatstuff.com ). He's recommending epoxy for structural work and polyester (either orthothalic or the other one, I can't remember right now, would have to look at my plans) for glassing up. Anyway it's the "better" polyester. I like the price of the polyester, but.................. Anybody have any thoughts on why I should go all epoxy or use the epoxy/polyester combo??? Thanks for any comments, thoughts. Amateur 2nd boat builder in the Great White Frozen North, Allan build in epoxy - period. polyester has no secondary bond strength and not a lot of primary bond strength. epoxy is not that much more expensive and could well save your boat. epoxy actually sticks to the glass where polyester does not; it merely hardens *around* the glass fibers. that's why a polyester laminate peels apart along the surface of the reinforcement when it goes into failure. -mo I guess that's why all my 30 year old poly boats just collapsed into piles of hairy dust in my backyard, eh? Zero strength, eh? How do you calculate the cost benefit from this supposed longer life for epoxy, given that the life span is still generally indeterminate for both types under reasonable stresses? I have heard of very few poly boats disintegrating in any remarkably shorter time than epoxy, even in contests involving rocks and stuff. Such extremeist statements suggest you must be a berserker stock market manipulator with interests and positions in the epoxy chemicals market bordering so extremely on the insane as to suggest you sell epoxy mainly to be able to continue to dispose of toxic chemicals added in small amounts to the resins, just like some shampoo vendors I suspected of doing just that until your arguement was so strongly stated and foolishly revealed ;-) Now, as far as skin irritation and developed allergies and consequent lifetime sensitivities and costs associated with respirators, deformed babies, etc, I would favour poly quite strongly for a hobby builder, especially a relatively inexperienced one, especially for a first build. Commercially, the evidence is overwhelming. I cannot imagine anyone smart enough to be able to afford the costs of epoxy being insensitive to those cost benefit analyses so evidently performed and adhered to by professional builders. You just try to get an informed professional to build in epoxy and then count the costs. -- Terry K - My email address is MY PROPERTY, and is protected by copyright legislation. Permission to reproduce it is specifically denied for mass mailing and unrequested solicitations. Spamspoof salad by spamchock TM - SofDevCo ® -- Terry K - My email address is MY PROPERTY, and is protected by copyright legislation. Permission to reproduce it is specifically denied for mass mailing and unrequested solicitations. Spamspoof salad by spamchock TM - SofDevCo ® |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Epoxy or Poly for poly repairs? | Boat Building | |||
epoxy does so pass water | Boat Building | |||
Epoxy sales | Boat Building | |||
Polyester epoxy | Boat Building | |||
polyester - epoxy bonding | Boat Building |