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Re: Epoxy: Type Recommendation To Avoid Yellowing?
By:Bill Hamm
Date: 8/10/2011, 11:09 am

: Hi,

: It sounds as though you might have used a different epoxy for the
: taped seams than you did for the hull. Do you recall whether
: this is the case? If you used the same epoxy for the whole boat,
: I assume that the extra material along the seams may have caused
: the different color there than on the rest of the hull. It would
: surprise me it that alone would cause what you describe though.

: In any case, although I have not used West systems to glass a strip
: boat, I have used it lots for other boat work, and I find that
: the normal resin (can't remember the number) with the fast
: hardener does yellow quite strongly over time, irrespective of
: exposure to light (for example inside a cupboard in a sailboat,
: ie. in the dark virtually all the time). If you happened to use
: this on your seams, I would not be surprised by your problem.

: Others with more mileage will have to provide their long term
: experience with epoxy on strippers, I have only built one boat,
: and it is too young to tell what will happen in the long term.
: However, based on what I have dug up on the internet, I went
: with Mas epoxy, and initially at least it is completely clear. A
: solid block of it an inch or so thick is nearly as clear as
: glass. I happen to have such a block because a cup of it kicked
: off before I managed to use it all - it got hot enough to nearly
: melt its way out of the plastic mixing cup it was in. :)

: Good luck with your overhaul,

: Best regards,

: Allan Edie

Hi Allan,

That's true, not used West's normal fast or slow hardeners in years but the fast does make a yellowish laminate that doesn't like sun much. I've been using their 207 special coating hardener for the past several years that now is completely clear, with perhaps a very slight blueish tint that is really hard to see. Only downside is it's not as easy to tell if the hardener/resin is mixed since they are both the same clear color (or lack of it).

Bill H.

Messages In This Thread

Epoxy: Type Recommendation To Avoid Yellowing?
Snoho3 -- 8/9/2011, 6:00 pm
Re: Epoxy: Type Recommendation To Avoid Yellowing?
Al Edie -- 8/10/2011, 9:51 am
Re: Epoxy: Type Recommendation To Avoid Yellowing?
Bill Hamm -- 8/10/2011, 11:09 am
Re: Epoxy: Type Recommendation To Avoid Yellowing?
snoho3 -- 8/10/2011, 12:24 pm
Re: Epoxy: Type Recommendation To Avoid Yellowing?
Al Edie -- 8/12/2011, 12:25 am