Promat Moisture Resistant Ready-Mixed Joint Filler^® is suitable for both interior applications, and is also specially formulated for use in semi exposed and high-humidity environments as a joint and screw filler for Promat MASTERBOARD^®  or SUPALUX^® for lining the underside of a carport, undercroft, etc.

When used in a semi exposed location, a final finish of a good quality exterior grade paint such as Sandtex, Weathershield or similar (by others), must be applied to the face of the boards.