sand it really roughly everywhere except the welds, then prime it in a thick double coat of matte black and leave it in the sun all day so it dries hard, then get resin and go over any surface where you sanded so hard that you can see it through the paint, then give it like 8 coats of high gloss black, and DO NOT sprac close to the deck or hold it one place too long, if you do that it will look really good, after that i get glue and paint over it as paint protection (make sure the glue drys clear) and then afew layers of clear coat for shine, then polish it and wipe it with car cleaning products to make it look amazing, make sure you hang it by wire when doing this so any excess paint can drip off and so it doesnt get dirt on it, after all that i suggest leaving it in the sun on a REALLY hot day to really bake the paint dry.