just got news getting resin epoxy stable a lot of uv so i give a try. simply brush on carbon 2 times and leave on a sun.

HEY CACTUS WHY YOU PUTTED YOUR MOLD INTO OWEN FOR HEATING? WHEN YOU MADE THAT PIECE MOLD FOR YOUR NEW RESTAURANT

I don,t think Vinylester will stand up to UV and I am sure polyester will not. Just take a look at those cheap Chinese car hoods after a year in the sun!
The only thing that I know of is a good automotive clear that is made for this purpose.
Fred

I've already used this basco filler and I'm not happy with it. It's like a black paste that fills the pinholes which suppose to harden and make your life easy with clear coat. most of the times it didn't dissapear the pinhole and when it did it left an angly black dot under the surface of the clear coat. Don't know if I did sth wrong but how hard would it be to apply it???

BascoPrime, not BascoFill. It's a clear primer
Mine is due to arrive this week. Very expensive.

sorry, the same goes for this one also, I've bought almost everything when I was facing problem with pinholes, even with this primer didn't have any luck, I had to spray it really thick in order to fill them causing wrinkles and lot of sanding later, also It seemed to darken the part. let me know how it goes for you