I have used polyester on my truck. Should only be used sparingly. One of the nicest paint jobs i ever saw was on a harley by a local fellow (now passed on) with a brush. I don't know for sure how he primed it, but he brushed on several coats of lacquer, one at a time, hand sanded each one,progressively finer until he was just buffing it. Would be a lot of work. I have used Martin Senor spray bomb primer with good results.
