First of all, I am no painter or expert by any means but have painted about 22 tractors over the last 3-4 years and should be much better than this. This is the first time (well second, as it happened the last time I painted) that this has happened to me. Usually I will just steam-wash the tractor well, hand sand some places and sheetmetal with paper or a palm sander, wire wheel the cast iron, wipe with lacquer thinner, wash with soap and water, then paint. Well, since I have started having the sheetmetal blasted and primed, I"ve wet sanded it(with 3 grit stages going up to 800), then washed with soap water, then painted. I"ve kept the same old routine on the cast (wash, wire wheel, clean, paint). The only 2 (last 2) tractors I"ve done the wet sanding to, have came out the worst.....with the red tractor worst than the one before it. Before I get too deep in the post and talk too much. I"ll post pictures of my set up I used and some pictures of my work before I was having these particular problems. Granited the other tractors were not perfect by any means, but the last 2 should have looked much better than those.