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Old 03-19-2013, 01:33 PM   #1
gwader

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Default Engine bay covers in C/F which resin handle heat

Which products west system, fiber glast etc. I did a test piece with West Systems in my daily driver and its starting to yellow. No UV clear coat. Its purely a cosmetic piece. I'm assuming its the heat since the hood is closed 99.9999% of the time

Thanks for the help.

Greg

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Old 03-19-2013, 02:30 PM   #2
gwader

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Tried searching but could come up with and good key work that hit the question. Heat, discoloring,

found one for yellowing.

I do have clear polyester from fiber glast. Guess I could use that. but, what about the heat?
http://www.compositescentral.net/sho...ight=yellowing
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Old 03-19-2013, 02:51 PM   #3
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I have used the US Composites Vinylester 700 series, and that claims its stable up to 700 degrees F, but I have never used it in a high heat application.
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Old 03-20-2013, 10:10 AM   #4
riff42

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700f for a VER?!?! That seems wrong. Most epoxies cannot handle that service temp, most thermoplastics can't even handle that!!!

But back to the main point. You need to get a higher service temp resin. I would not expect a PER to survive long under heat.
I need to hook up my temp recorder under my hood and finally get some #'s for yall! Exhasut gas too!
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Old 03-20-2013, 10:15 AM   #5
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normal west isn't that great for heat resistance. Search the datasheets, Tg is roughly the heat resistance (Glass transition temp, after that the resin gets rubbery and print etc will show)
You probably will need to do a post cure, bake the resin to build up the Tg to the optimum.
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Old 03-24-2013, 11:54 PM   #6
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do you used ortho polyester or iso polyester.? iso is better at heat resistance..
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Old 03-25-2013, 09:44 AM   #7
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Thanks for the tips. I 'm still testing the idea of clear polyester. The WS is to low.
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Old 03-26-2013, 04:16 PM   #8
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We use vinyl Esters on aircraft cowlings which see high temps from the exhaust stacks.
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Old 04-01-2013, 07:44 AM   #9
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Thanks guys!
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Old 04-05-2013, 10:17 PM   #10
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I would try a high temp clear epoxy such as HTR212-386 from Resin Services. It can withstand 375f without a post cure. Your other best bet is to sand the part down carefully removing the surface resin and careful not to sand into c/f. Use 220 paper. Then spray 2k automotive clear acrylic urethane.

P.s. clear polyester will yellow from heat.
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