Don,t use laquer. Use urethane primer over etch or epoxy before topcoat. The fill properties, topcoat gloss holdout, chip resistance are excellent for urethane and non-existent for laquers.
Etch prime has to be re-coated in 4 hr. to 1 week, depending on type and brand selected. Bare metal can be coated with epoxy or etch. for a shop coat I would put it in epoxy for the winter, then next spring sand with 180 then apply urethane primer.