Bona Polyurethane Primer/Moisture Barrier 5L

• Helps mitigate potential moisture issues, like cupping*, originating from below the membrane, in new and existing construction
• When used as a primer, one coat increases adhesion over sealed subfloor systems, ie. AdvanTech™
• Can be used as a vapor retarder in place of felt paper for wooden subfloors up to 20% MC
• One coat can be used for damp proofing concrete subfloors up to 95% RH & 18 lbs.**
• Dries fast allowing nail-down installation immediately
• No more tears in paper or seams to be concerned with – all continuous film offers more uniform coverage and moisture protection
• Easy to apply – rolls on
• Suited for underfloor heating+ 

* Can help prevent cupping caused by excessive subfloor moisture.
** Only one coat needed when used with 1250 or 1500 trowel and any Bona Silane Adhesive. Two coats required in all other installations when the above criteria is not met.
+ Radiant heat systems will have a maximum moisture protection of 6 lbs. or 80% RH.