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I personally always start with urethane compatible products from bare metal. It is not advisable to spray urethane over lacquer basically because lacquer reacts to temperature. Urethane stays in its current state, once fully cured, regardless of temperature (other than a little shrinkage from the solvents). With temp changes, the urethane topcoat will evetually fail over a lacquer undercoat because lacquer can become soft with extreme heat. A PPG paint rep told me if you must spray over lacquer, to atleast put down a urethane sealer or primer. That will give the paint better longevity.
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