I wish I would have used a bigger test space also. to the left of the test area is what I used for practicing welding trim holes shut, so it's got lots of grinding needed if I want to use that area, but I just might to do more testing.
One thing I'd like to know is how you clean your roller after use? I have been washing it out with mineral spirits and water then using a paper towel to dry it, but I think some of the fibers from the paper towel are sticking to the roller and coming off in the paint! I'm not sure the best way to clean it off.
Oh well at least I'm figuring this out now without doing an actual car.
