Hand a completely stripped frame and fork over and then lots of discussion and mutual agreement on process. Taping off chrome, filling in threaded holes with the high temp wax they use or taping off completely in the case of larger threaded tube openings, sand blasting the ID of tubing where possible, etc. they need to do a LOT to do a good job particularly if your prior paint job is pock marked with rust or you have corrosion in your bottom bracket, head tube, or other areas that will create a border with your coating. I hand sand mine down in trouble spits with a medium grit if I can see visible rust before I hand it over for media blasting.