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  #11  
Old 01-03-2019, 07:13 AM
Andrew Anunson Andrew Anunson is offline
 
Join Date: Apr 2012
Location: Pound, VA
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Quote:
Originally Posted by wawrzynskivp View Post
An A&P advised me that black paint will cause my fiberglass to go past its Tg and distort.
Composite aircraft parts are painted light colors so that the core material (most often foam) does not exceed temperature limitations (in addition to fiberglass and epoxy getting to hot). The foam core is the part that will melt from high heat.

What is the core material of your composite canopy? What is the temperature limitation of that material?
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  #12  
Old 01-03-2019, 08:02 PM
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bruceh bruceh is offline
 
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My wing tips are black and I haven't had any issues with heat from the sun. Even in 100+F temps in the summertime.

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  #13  
Old 01-03-2019, 09:52 PM
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Captain_John Captain_John is offline
 
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All of my fiberglass is painted black.

CJ
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  #14  
Old 01-04-2019, 08:18 AM
broken1234 broken1234 is offline
 
Join Date: Nov 2008
Location: Dyer, TN
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The key to making black (or any dark color) last on glass is filling the weave with something that won't shrink, and letting it cure... TIME is your friend... avoid polyester products...
Brad
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  #15  
Old 01-05-2019, 06:09 AM
penguin penguin is offline
 
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Location: England
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Quote:
Originally Posted by Andrew Anunson View Post
Composite aircraft parts are painted light colors so that the core material (most often foam) does not exceed temperature limitations (in addition to fiberglass and epoxy getting to hot). The foam core is the part that will melt from high heat.
Sorry, this isn't true! The core material generally has much higher temperature limits than the epoxy resin. It very much depends on exactly which resin and which core material we are talking about, there is a wide variation in properties. I agree with Brad about avoid polyester - in fact the least filler the better!

Pete
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  #16  
Old 01-05-2019, 05:44 PM
Brent Brent is offline
 
Join Date: Jan 2013
Location: Hanover, Pa
Posts: 24
Default Black fiberglass

I used black primer surfaces on the cowling. I had problems with blistering of the gel coat. From my experience I would recommend NOT using black. Having said that, I could perhaps just be unlucky with my particular cowling.

Brent Owen
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