john1,

I have used PPG Omni epoxy primer - so far so good.

"To each his/her own" regarding single stage vs two stage (base - clear). I recently used PPG CONCEPT (DCC) single stage urethane finish coat on my 1954 Suburban and is seems to be durable and buffed to a high gloss (buff it after a day but do not wait too long because it gets quite hard). On this restoration, I wanted a durable paint that did not look like base/clear.

I do not know how the PPG DELTRON single stage acrylic urethane compares in cost and quality to PPG CONCEPT (DCC) single stage acrylic urethane.

Tim