Bona® R540 1.32 Gallon

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  • Regular price $125.00

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.


  • 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 – continuous film offers more uniform coverage and moisture protection
  • Easy to apply – rolls on
  • Suited for underfloor heating‡
  • Only one coat needed when used with 1250G or 1500G trowel and any Bona Silane Adhesive. Two coats required in all other installations when the above criteria is not met.

† Can help prevent cupping caused by excessive subfloor moisture.
‡ Radiant heat systems will have a maximum moisture protection of 6 lbs. or 80% RH.