No went well in the past with polyester. 

I always thought you couldnt vacuum polyester as it boils. There's a chemical reaction releasing gas too.

Well judging by the video, you applied poly gelcoat, placed the fabric on the tacky gel and then infused it with epoxy resin?? Well there must be some sort of chemical reaction occurring as the gelcoat occupies some of the fiber spacing. Or the heat from the poly is causing that surface. What puzzles me is why you do it wet in wet in the first place? Gelcoat and subsequent application of fabric with spray adhesive is the route i would have taken.

I realize you didnt use epoxy gelcoat because of the polyester mould. I would still let the gelcoat harden fully if it is not epoxy to epoxy. It is just a suspicion, but you described everything else. It could also be that the soric has printed through, don't know how many layers you used.

Interested to read some other opinions.

cheers n good luck

Hi so a while ago I've worked on a project using grey poly/carbon twill