This is the first time with Clear Glass. I was wondering. Do you sand the entire glass face and belly. Also what grit do you go up too. 400grit?

If you are talkin for spraying finish,sand to at least 220 for satin . Sand the whole surface. The glass will turn sorta milky colorwhen you sand,but don't worry, it'll go clear as ,well... glass when you spray it.

new glass?, the Gordons Botuff clear glass I bought was sanded on one side from the factory,when laminating the shiney side goes outside, pre-sanded side inside.