Changing color on interior parts

I also changed the color of my interior parts from green to landau black,
worked great, ALTHOUGH.. I spoke to the guys at EASTWOOD at the Fall Carlisle Event and was told the prep was a waste. They told me to really scrub the piece real good with dish soap and HOT! water, Then to rinse it very througly with alot of hot water, Then lighty spray the first coat, wait twenty minutes then continue as normal. Cant say thats THE way to do it, but I did with mine, and all pieces came out great. (kick panels,a pillar,sunvisor, etc) Guess well see if it holds up.

Just FYI