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From: Tom (no email)
Date: Sun Oct 01 2006 - 22:03:39 EDT
At 03:34 PM 10/1/2006, Bob Clinkenbeard wrote:
>I know some here have considerable experience with epoxy.
Well, I have some composite construction experience... but always take free
advice for what it is worth. ;)
>I have a large boat trailer that I had sandblasted and primed. I have
>coated the entire trailer with 2 coats of West System 105 resin and 206
>slow hardener. I added black pigment and the result is a glossy black trailer.
>My question is, will the epoxy degrade with time due to UV...even with the
>black pigment in it?
Yes. It will just degrade a bit more slowly. Also, black is a poor choice
for epoxy or epoxy coated objects. Most epoxies used by boat builders are
sensitive to heat, and a black surface in the sun can get hot enough to
cause serious problems.
You are on the right track however. Pigments in paints and other
overcoatings can block the UV very effectively.
>I understand a two part linear polyurethane is the best coating if I need
>to add a finish coat.
>
>What do the experts think I should do at this point?
Paint the trailer. Any good quality paint will be fine. The better the
paint, the longer it will last, but basically ANY paint will provide tons
more UV protection than the black pigment you added to the epoxy.
Bare epoxy, pigmented or not, weathers poorly.
>The trailer will be immersed in salt water to launch the boat. I will
>have a water tank and pressure washer on the tow truck to rinse the
>trailer, boat and brakes on the trailer.
Makes no difference to the epoxy. As long as the coating remains intact,
the exposure to salt water means nothing to the epoxy.
>Obviously, I don't want to do this again, so any suggestions will be
>greatly appreciated.
>
>Thanks,
>
>Bob Clinkenbeard
>24' custom trailer trawler
>http://home.bellsouth.net/p/PWP-aboardbobbinalong
Well, those were my suggestions.
Epoxy is great stuff and impervious to most anything you throw at it...
except sunlight.
Tom
Tom & Jackie O'Meara
ex-Seaskate, Searunner 40 Tri
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