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#1
posted to rec.boats.building
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epoxy exposed to the sun!?
Last fall the deck on 14' sailboat cracked. I put some fiberglass/epoxy
around the crack to reduce flexing and stop it from getting worse. Three weeks ago I put the boat in the water. Today I sailed it for the first time. I meant to put paint on the epoxy; I thought I put paint on the epoxy. Obviously I didn't because it has developed a yellow cast. It doesn't seem any different than when it was new, except for the yellow cast. Would three weeks of sun ruin it, long term? Or can I just paint it now and be glad I caught it in time? I know UV degrades epoxy, but have no other info. Any advice here would be appreciated. (yes, I know that putting new fiberglass over cracks isn't the right way to fix them; but I was going purely for function without regard to appearance.) |
#2
posted to rec.boats.building
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epoxy exposed to the sun!?
Toller wrote:
Last fall the deck on 14' sailboat cracked. I put some fiberglass/epoxy around the crack to reduce flexing and stop it from getting worse. Three weeks ago I put the boat in the water. Today I sailed it for the first time. I meant to put paint on the epoxy; I thought I put paint on the epoxy. Obviously I didn't because it has developed a yellow cast. It doesn't seem any different than when it was new, except for the yellow cast. Would three weeks of sun ruin it, long term? Or can I just paint it now and be glad I caught it in time? I know UV degrades epoxy, but have no other info. Any advice here would be appreciated. (yes, I know that putting new fiberglass over cracks isn't the right way to fix them; but I was going purely for function without regard to appearance.) ------------- in sunlight the epoxies all yellow and lose their gloss. Takes years to damage the epoxy beyond just surface yellowing. In commercial applications the yellowing is considered cosmetic (at least for the first few years!). No harm done. Varnish has good UV blockers and is often applied over epoxy on boats. Makes the life of boat coatings much longer then either one alone. paul oman progressive epoxy polymers www.epoxyproducts.com/marine.html |
#3
posted to rec.boats.building
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epoxy exposed to the sun!?
On 2006-07-02 19:01:07 -0400, Paul Oman said:
Toller wrote: Last fall the deck on 14' sailboat cracked. I put some fiberglass/epoxy around the crack to reduce flexing and stop it from getting worse. Three weeks ago I put the boat in the water. Today I sailed it for the first time. I meant to put paint on the epoxy; I thought I put paint on the epoxy. Obviously I didn't because it has developed a yellow cast. It doesn't seem any different than when it was new, except for the yellow cast. Would three weeks of sun ruin it, long term? Or can I just paint it now and be glad I caught it in time? I know UV degrades epoxy, but have no other info. Any advice here would be appreciated. (yes, I know that putting new fiberglass over cracks isn't the right way to fix them; but I was going purely for function without regard to appearance.) Also, whatever color you paint it, make it a light color. Epoxies are known to lose considerable strength at the temperatures a dark-colored painted surface can reach. Epoxies generally fail at lower temperatures than similar polyester or vinylester resins. |
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