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#1
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That is true. epoxy is fine over vinylester and poly. but not the other way around. You cannot use gelcoat over epoxy either. that is why you see your high end yachts using epoxy paint/two part urethanes as their topcoat. i personally think it is a lot better. and theres a reason why hatteras yachts/and paul mann yachts uses epoxy. They aint cheap either.
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#2
10-15-2009, 04:43 PM
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Quote:
There's a nice 2008 Paul Mann sitting in 200 ft of water off Beaufort Inlet due to an epoxy issue, epoxy tends to crack when under a lot stess and you never see the high end race boats built with it due to stress cracking and weight.
__________________
 1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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#3
10-15-2009, 06:48 PM
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Epoxy would then limit the rebuilt transom to painting with epoxy paint or urethane. It would seem that epoxy would be more expensive and require more paint work than using regular vinylester resin and gelcoat, I mean you can match and blend gelcoat back to the edge of your repair, sand, buff done.
When using epoxy would you recommend stopping at the edge of repair and attempt to feather it in or paint the entire hull? School, I never heard of epoxy being prone to crack under stress. All I ever hear is good. Is it an issue with it being so ridgid that it won't give? Or maybe a glass issue? I thought high performance boat guys built epoxy boats. I think some jet skis are also epoxy. One more question and I will unhijack this post- What is used to wet out kevlar? 
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#4
10-16-2009, 06:55 AM
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you can wet it out the same as fiberglass cloth, you have so many issues with epoxy, set up and sanding is a pain too. just get resin from a local boat builder.
__________________
1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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#5
10-16-2009, 05:36 PM
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You guys need a ref
Damn, i will re-subsribe after all.
Ben Fishin may know epoxy, I think epoxy has a much longer pot life, it is quite strong and cost more money. The fact that it cost more money is a huge drawback so the "superior anyway you look at it" approach is BS. It may be far superior to the vinylester or poly resin in your eyes as an engineer or on paper. However, I don't have a boat constructed with epoxy. My Wellcraft was all vinylester resin from the factory and it remains so after a major rebuild without any structural issues. You are an engineer, as such I am sure you are aware that engineers designed and built the Titanic. Having such a wealth of knowledge that most of us do not have, you may have come off being a bit condescending. Perhaps you should have said that you strongly believe it to be the best resin. I don't put words in anyones mouth. Resin is a wetting agent not the impact strength of a boat. Without fiberglass the epoxy is useless, same holds true with any resin. The cup of resin test defies logic. The reason the vinylester cracks is due to the thermal reaction from mixing it hot, anyone that has used vinylester resin knows that if you mix it hot it will be brittle. The correct mixture of tiny amounts of catalyst to vinyl and poly resin and the correct ratio of resin to glass is an art that has proven its durability and stood the test of time. You suggest we mix the vinylester resin and allow it to heat up in a cup beyond the working parameters of the product. You don't apply resin when it is on fire, you mix the product and get it to the glass ASAP. Because the resin is spread thin over the glass in a much larger area, the heat during kick simply dissipates. Epoxy is in its infancy when compared with polyester and vinylester resin. I have nothing against it at all. As a layman I would think if it were stronger than the surrounding vinylester product that you were repairing it would not bend, flex, expand, contract or vibrate at the same frequency and eventually you would have a failure in the form of delamination. It may bond so well it will never come apart, can't say. "I know so and so and You don't know crap" sounds kinda godlike, but the pissing contest is useless to the poster that wanted to know what weight of cloth he needs. I'm not even looking for glass, mine is done. Frank Sinatra School, I don't know about the Mann boat that went down, you might be right. IMO epoxy is not the best for all applications. Most mass production boats don't use it because it is cost prohibitive and it is incompatable with gelcoat in the molds. Because epoxy hulls must be painted after, it probably lends itself to larger boats where the molds are not as tooled and the manufacturer will spend hours making the hull smooth enough for primer and paint. You may have gone off a bit early on the new guy. Sounds like he can hold his own, well educated too. But I don't suspect my opinion matters much, I am a newbie too and fully expect to fall on deaf ears. You both got passion for the thread, I will give you that. I always appreciated your input. MJ - Take my name off the list for that Album would you.
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#6
10-18-2009, 08:08 PM
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BenFishin you are new and Skools no's better, But as owner op here I do not allow personal attacks here!!!!
We all get along here and I like it that way, and I do my best to head off stuff as soon as I can, So this thread has been edited and we will go back to what Joker was asking, If we can't do it with out a fight i will band the fighters! This will be thye only warning!!
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