4212 SEAL-B A High Intensity Machine Brightener Seal-B is a lusterizer 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 a very mild cleaner and silicone, but no wax. It wont hold up by itself but it will accept a nice coat of wax.