If you are gona clear it you might as well just put a coat of base on too....but to do that you will have to sand the enamel and put a good urethane primer over it...base coat will lift the enamel( I think) I know for a fact that the base coat will lift laquer. At least every kind I have used will.This way you can block sand it and get it that much straighter..unless it is perfect already.
JMO