The webbing spray pattern and the multi-adjustment spray nozzle provides a lot of value in one can. Easier to use and saves time compared to bulk spray equipment. Glasscoat is an inorganic white woven fiberglass mesh used to reinforce the joints and seams of thermal insulation and air ducts. It's coated on one side with pressure sensitive adhesive and the rolls are individually labeled and shrink wrapped. RCD Mastic Brushes are the best brush to apply RCD Mastics. Compatible with solvent based parts cleaner, reusable, yet inexpensive and can be thrown away.