how do u paint parts so it goes on even and dont run?

 

make sure its warm enough. if its too cold, the paint wont dry fast enough, do a few light coats overlapping eachother about 50% and let the paint flash between each coat. and remember, preperation is key! sand the surface nice and smooth, blow off all the dust, clean with a quality wax and grease remover, wipe with a tack rag, and use a good primer on bare metal or plastic.