kilz is the primer. There are both water and oil (original) based varieites, I have only used the oil based. You can't spray this in doors as the odor is horrible. It also comes in Gal. cans and 5 Gal Pails, I have not used it any other way but from the spray can. I have used this with normal automotive primers, DuPont, Napa, and multiple types of spray paints. It may take a few coats to fill depending on the weave of the glass. Use a few light coats, it dries quickly above 70 deg. One warning is that it is not cheap in the spray can but can get more reasonible in the gal. cans, and pails. Use it just like normal primer, spray it on sand it, fill and then paint as usual.