4212 SEAL-B Is a High Intensity Machine Brightener. Seal-B is a lusterizer, brightener and swirl mark remover. It is exceptional on black and other dark colors. Seal-B is grey in color and will not show residue; very important to high volume detailers. Seal-B contains the finest polishing ingredients and special polymers to completely seal the surface and produce an exceptional shine with great depth of gloss. Seal-B is designed to be used with a high speed buffer and will stay wet under a foam buffer head as long as desired. The longer you buff the deeper the shine.  When you are satisfied with the depth of gloss, stop buffing and wipe the car down with a dry microfiber or terry towel. Seal-B contains a mild cleaner and silicone, but no wax. It won’t hold up and protect by itself but it will accept a nice coat of wax.