Powder coating

I want to have my p3 powder coated. Any concerns or advice regarding preparation or disassembly of parts prior to coating ?

I have an older P3, one of the first ones made with the flat charcoal black paint. There are a good deal of chips and scratches so it is time to get it refinished. I am considering having it powder coated for a number of reasons including cost (free) and durability. Anyone ever have their bike powder coated? IF so what things should I worry about and watch for as far as prep goes.

While we’re at it how about color suggestions, I am pretty wide open. But considering going with a Glossy Black, to keep it the same color as it currently is- not a lock though.