Bona’s R540 Moisture Barrier and Primer

2 13 Bona Np

The Bona R540 is a multipurpose, damp-proofing primer designed to mitigate vapor transmission on wooden subfloors. It can also be used as a sealer for concrete substrates up to 95% RH and 18 pounds when applied as a two-coat system. It is easy to use and increases adhesion over sealed plywood floors, the company says.
bona.com

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