Ok...I did a small test on my aluminum boat. In one area I stripped the paint with a wire brush and paint stripper disc on a high speed electric tool....on another area I used Zip Strip. I then painted both areas with black paint to see what the finish would look like. The area that I used mechanical means to strip looks terrible (dimples/high spots/low spots)....The zipped stripped area looks smooth as glass! Looks like I will zip strip the entire boat. How can I smooth the rough area out that I screwed up??????