Just opened it and I can’t imagine thinning it further? There’s hardly any solids in it at all. Tried some on my under hood and it’s like spraying lacquer thinner. I’ve almost used a 1/2 quart and not much coverage. I’m using a Finish line HVLP, 1.3 tip, and 23 psi at the gun tip … per my gun instructions. What’s wrong? Thanks in advance.