I have the Avery tool kit with the flush swivel rivet set. When I set flush rivets on say the skin, either the alodine surface is smudged or homogeneous scratching takes place from the rivet set. I don't know how to describe it better. It doesn't wipe off with my finger. I didn't try a solvent yet. I have used masking tape or the transparent tape Vans offers to keep the rivet set from contacting the surface, however if any of my flush rivets or slightly proud of the surface, the rivet set directly in contact with them seems to drive them more flush than if they are covered with tape. What causes the marring of the surface when I have no tape in place? Should I prevent that with tape or some other method?