This may be very basic, but it sounds to me like you are trying to paint lacquer over enamal, This
usually never works.
Nope. Both are enamel. Even painting the same paint over itself caused a problem. With Rustoleum x2, I have not had this problem, I think because it includes a primer. The Krylon MAXX is supposed to have a primer in it, but it did not work. The cans talk about 48 hours or less than 2 minutes between coats, but I have not had to wait that long before when using an oven. I have proof that the rattle can thinner is the main culprit, because I bought the same enamel in the non-spray form, and I can brush that on without a problem, even if I thin it some with Naptha.
Also, a bit surprising that the blue painters tape damaged the finish too. I am sure this was due to the paint not being fully cured, but I am also reading that these tape adhesives try to "bond" with the paint to maintain an edge. On my next job, I plan to mask the primer and not try to paint over finished enamel. I also plan to not try to mask and paint assembled parts. Just learning as I go here...