Lucas #5500 Seam Sealer is available in three grades; Gun Grade (G), Mastic (M) and Cement(C). Gun Grade is a pumpable liquid sealer designed to be applied with a wand, Mastic is an intermediate viscosity designed for manual application to seams and fasteners and Cement is a highly stable non-self leveling grade for repairs, large gaps and vertical surfaces. #5500 is used to patch and repair metal roofs prior to coating with #5100 and #5000 as well as to repair those roofs later in their life cycle. #5500C is also an excellent all-purpose caulk and sealant.
