How do you repaint a BMX bike?

Answer 1

Preferably you don't. Any paint you can apply at home is likely to chip and scratch much easier than the factory applied one. If you want to do a really good job, strip the bike to the frame, them leave it to a powder coater, preferably one who starts by having the frame media blasted down to the bare metal first.

If you still want to do it yourself, start by sanding the whole bike to give the new paint a rougher surface to adhere to. Clean and degrease, then paint. I prefer hammerite, as it's quite strong and rather forgiving. If you intend to rattlecan it, use many thin layers. Work in a well ventilated area and leave the bike for several days befor starting reassemblly, that'll give the paint some time to harden up at least.