All paint systems are different, therefore I cannot advise. Generally speaking, you can't put an enamel over a laquer, but you can put a laquer over an enamel. The clear should adhere alright to the bare steel. Normally it only requires 320-400 grit wetsand or drysand. I would go with a cellulose based laquer, it should adhere to both the steel and the existing paint.
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