Having a problem with blisters in the paint again. Does anyone have a good tip for repairing these blisters short of cutting them out and doing a spot paint repair?

I seem to have this problem with this when doing high-build primer and chart tape panel lines over glassed airframes. It seems to be the primer blistering up from the glass cloth in dark color areas when exposed to the hot sun for any extended time...like 8-10 minutes. Granted, it was 103F in the shade here in Charlotte today, but this has happened before when it was only 85-90F on a different plane.

I'm hesitant to glass and paint another plane if I'm going to continue to have this result, which sucks since I really enjoy the detailing. I've done one using the Polycrylic and glass cloth method and this one was with WestSystems epoxy and glass cloth. After finishing the glassing, a light coat of automotive primer was applied,sanded, low spots identified, spot puttied, sanded, repeated as req, then final sanded with 380 grit. Chart tape applied, Primer built up, sanded, tape removed, color coats(Krylon, rustoleum, valspar rattle can stuff etc), weathering and a final clear coat of KlassKote satin. The blisters have always been under the primer...paints and primers compatability don't seem to be the problem. More of an issue with getting the primer to bond with the glassing medium. I have always wiped down the surfaces after sanding with denatured alchohol and allowed them to drywell before begining to prime to ensure a clean surface.

Where am I messing this up?

Blister on the base of the "t" looking character and a larger one just to the right of it; also just to the left of the base of the "7" looking character at the wing root/wing walk.

Thanks