I have only done A couple, primer/sealer then base coat & urathane clear. It has been 3/4 years and they are holding up great. Good luck!
first sand it then seal it then shoot a few coats of basecoat then shoot a couple coats of clear on it and youll be golden!!!!!!!!
I've used 2 stage and single stage with good results. If you use single stage, must sure you use a good hardner and you will be fine.