I was wondering about the diameter of the 3M Windo-Weld Ribbon Sealer that is used to reinstall the rear windshield on late model Corvairs. The local AutoZones have 3 sizes available, 1/4", 5/16" and 3/8". The Clarks Cat. says that installed theirs compresses to about a 3/16" thickness. Is the 1/4" size the correct one to use or is one of the others more appropriate? Thanks, Chuck