Try searching You Tube for answers.
https://www.youtube.com/watch?v=2PKn-59pHNM
In my opinion very small bubbles are cosmetic but not structural concerns. I got more than a few bubbles in some of the taping and the over the top glass. I filled some, sanded out a few and ignored most. If you are planning to leave your TD bright, I’m not, you have to decide which of the small bubble are in cosmetically critical areas.
