Did you wet lay the cloth? When I did mine I did not, I used 3m adhesive and put cloth down and then went over it with resin. I struggled with tiny air bubbles. I sanded the couple bubbles I had out and laid a small patch of cloth and resin. But man pin holes and micro air bubbles ????. I had one that took 3 days to find, was literally the size of a pin head, only way I found it was my light hit it just right. Yours looks very good so far. I had 1 spot that didn't look like any resin was even on the cloth but is as smooth as glass, thought that was odd. As far as thickness of resin, I did 4 coats of resin with a sanding in between to get all the high spots down. It's like a piece of glass now inside. 4 years later after a dozen leaks when I first got it up, it's doing well.