Hi, just attempted making my first mould of a spoiler. So I pretty much followed the how to make a carbon bonnet video tutorials but one thing I didn't have was filleting wax. I used signboard all the way round and the inevitable happened. The gel coat seeped through under the part. What's worse was that it was difficult to get the chopped strand mat to stick into the edges without creating an air void which weakened the gel coat at the edges. As you see in the picture below, I got the basic shape and very nice shiny surface even with PVA, but the "mechanical lock" caused by the gel coat made me impatient and I ended up forcing the part out and cracking the edges around it. I really don't want this to go to waste, so is it worth repairing? Can I use fibreglass car body filler to do the job? Or is this a better way?

I saw this first tip on YouTube.