Bona R540 is a polyurethane reactive primer that is compatible with the entire Bona Adhesive System. It is specially designed to mitigate vapor transmission on absorbent and non-absorbent floors, including Gypsum-based underlayment.
*Only one coat needed when used with 1250G or 1500G trowel and any Bona Adhesive. Two coats required in all other installations when the above criteria is not met.
For more information, visit bona.com.