Mr. Surfacer 1000 contains finer granules than Mr. Surfacer 500 and is useful for filling in bumps, dents, scratches, for removing bubbles and finishing bases.  Can be diluted with either Mr Thinner or Mr Levelling Thinner. With the finer granules after sanding with waterproof sand-paper, a perfectly corrected surface is possible. Available in bottle and spray.