I'm not a professional painter but I have painted numerous boats stem to stern in earlier years. Before the first one, I had a lesson from an auto body painter. What he told me worked for me also. The first step was to thin the paint more than it says on the can until it begins to look thin. Then spray what he called a thin tack coat that looks awful, blotchy and you can see through it. Go back to the beginning location and shoot the real coat. You may need to wait a few minutes for a bike to get the tack. Somehow, the tack coat helps the subsequent coat to stick. With thin paint, you will need slightly less less air pressure, otherwise you get too much paint volume.