October 30, 2023 MasterSeal P 640 admin 0 Comment Product List MasterSeal P 640 is a single component. polyurethane based, solvent containing primer for absorbent surfaces in applications where MasterSeal M 640 & M 635 is utilized. Tagged on: MasterSeal P 640 is a single component. polyurethane based, solvent containing primer for absorbent surfaces in applications where MasterSeal M 640 & M 635 is utilized.
