Gelcoat surface problem


Gelcoat surface problem
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Zymka
Zymka
Zymka
posted 9 Years Ago HOT
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Good day everyone!

  I have been doing some carbon fiber stuff with vacuum infusion, and have had great results for most smaller parts. But once I make a bigger flat panel (bonnet top) I get this problem:
The gelcoat has small holes mainly between the fibers
This is how I made the parts:
PVA + wax on surface
sprayed gelcoat about 0,6mm GC50 + 15% styrene and 2% mekp , let it cure fully overnight
twill carbon 200gsm + 2 layers of 313gsm biaxial carbon fiber
peeply, perforated film,  mesh
infused with in2 mainly with fast hardener(as I ran out of slow one) and feeded with extra resin after clamping vac hose
postcured 10h at 50C and 5h at 60C

http://www.talkcomposites.com/Uploads/Images/c3e9b3fb-afe4-4f63-bd34-a48e.jpghttp://www.talkcomposites.com/Uploads/Images/675ed7ec-605d-4ae8-a4bb-8f55.jpg


Could this be because of the part shrinkage when postcuring?

Thanks!
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Gelcoat surface problem
Zymka - 9 Years Ago
     Yeh that looks like shrinkage to me. To be honest, it sort of looks like uneven post-curing. Does...
Hanaldo - 9 Years Ago
     That might be possible, my oven isn't very precise, and I did instant jump from 50 to 60C, I kept...
Zymka - 9 Years Ago
     HI Zymka, Have you tried without the Styrene? I suspect thinning down the GC50 has meant that...
Warren (Staff) - 9 Years Ago
     I haven't tried without thinning for bigger panels, as I liked the flat surface when I sprayed...
Zymka - 9 Years Ago
     You can sand it no problem, just be careful not to pre-release it from the mould surface if you're...
Hanaldo - 9 Years Ago
     Yes, I like it when its flatter , because the top layer looks much better when fillaments are laying...
Zymka - 9 Years Ago

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