|
The most important thing to do before sand, sand ,sand is clean, clean, clean. The surface that you are going to paint must be thoroughly cleaned of ALL surface dirt and more important all wax and oils. You need to wash well with a mild soap (sometimes two or three times) then use a solvent type paint cleaner and a cloth with no chemical residue (virgin cheesecloth is good) and apply and wipe off several times. If any wax or oil is left on the surface the paint will not stick to that spot and the surface will be irregular. Be careful that you don't touch the clean surface with your fingers (or even lay a roll of masking tape down - leading to adhesive residue on the clean surface) or you will leave skin oil and have to clean it again. If you sand before the old surface is completely clean you will just be driving the dirt and oil into the surface and you may not be able to remove it later. As for using a roller I don't know if that is a very good idea. Most automotive paint is pretty thin and formulated to be sprayed. Usually rollers for house painting, etc. are made for much thicker paint. You could probably get better results with Krylon spray cans if you cleaned and sanded well and weren't too particular.
|