Bob, I went back and read through the tips, and they are great. Especially Shine's comment that "... the razor blade is just part of it..." My paint guy told me to take a single edge blade and wrap the sides & edge with masking tape, leaving about 3/4" of blade exposed. Use it like a scraper, following the direction of the run (like gravity pulled it), and with careful use it will stop cutting when the run is as thick as the tape. At that point it can be blocked smooth. I took it one step farther and rounded the corners of the blade on a smooth grinding wheel to eliminate any gouging effect on convex surfaces, and I also have been successful doing an initial "shave" of the highest parts, running flat to the surface on the tape, which puts the blade slightly above the surface. Tedious work, but just another step for a rookie painter....