Most blisters are caused by either some type of contamination or are the result of what is called "gassing".

First, when you wipe the surface down prior to applying your primer, are you wiping it dry also? If not, you might consider starting. If you don't wipe it dry with a clean cloth, you're taking a chance that whatever contamination may be on the surface is just being rubbed around and not totally removed.

As for gassing, basically that's when something in the resin or another coating layer isn't completely cured to a point where you are ready to apply the next coat. In other words it can trap solvents and since paint dries from the outside in, when that outer layers dry up they trap solvents and as the temp goes up, it wants to evaporate. Since high build primers are designed to provide some build and fill imperfections in a surface, it's easy to put it on thick and try to recoat before it's ready. Same applies to resin.

There are/could be other things going on with yours but these two items are where I would start. Thin layers, wipe dry and time to cure between different coatings.

Hope you get it worked out.