By CarbonBro - 9/15/2020 7:33:48 PM
Hello I am new to this forum and the Composites Industry. This was my second time making a Carbon Fiber panel, I will be trimming several RC car pieces out of this Panel.
The first time I did not use vacuum bagging materials and this is how it came out, rear glossy and stiff.
I use Partall wax #2 and PVA from Fibreglast as my mold release agents. I use a Sheet of home depot glass for my glossy side.
This second time I used the same glass surface and the same release agents. I tried experimenting with vacuum bagging materials and used a slower hardening Epoxy resin.
I used 4 layers of 3k 2x2 Twill carbon the size of this is around 12"x16".
I applied vacuum for around 20 minutes and noticed it had a significant leak in one of the corners where the tacky tape joined together.
I resolved the massive leak. left it over night in my shed with temp around 70 I assume(Didn't check)
checked it in the morning and it had no vacuum, probably another leak.
This is how it came out
  
I suspect that this distortion was caused by a leak in the system or wrongly mixed epoxy.
Any advice is helpful and wanted.
Thank you for your time.
-CarbonBro
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By Warren (Staff) - 12/10/2020 9:54:21 AM
Yes Fasta is right. We tend to recommend around 20% vacuum as a starting point then vary up or down to get the desired cosmetic finish. You can see our video on a simple vacuum bagged part here:
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