The Safe Way to Ease Moisture Issues Quickly!

Bona R540 Moisture Barrier/Primer is a one-component roll-on moisture membrane specially designed to mitigate vapor transmission on absorbent and non-absorbent subfloors. The polyurethane reactive primer is compatible with the entire Bona Adhesive System.

Key Benefits:

• Mitigates potential moisture issues, like cupping, in new and existing construction
• Substitute for felt paper installed over plywood sub-floors **
• Increases adhesion over sealed plywood floors
• Can be used as a sealer for plywood subfloors up to 20% MC
• Can be used for damp proofing concrete subfloors up to 95% RH & 18 lbs*
• Dries fast allowing nail-down installation immediately

Technical Data Sheet