Since there are quite a few of us here that build our own parts I thought I might share some of the gems I found for metal preparation. I get these from Harbor Freight, cost is about $5. The benefits I found with these is that unlike flap discs they remove little to no metal.
This is roughly 10 seconds worth of work, they remove paint, rust, and whatever else very quickly without gouging the metal.
This is roughly 10 seconds worth of work, they remove paint, rust, and whatever else very quickly without gouging the metal.