VersaProof™ Primer EWB is a 100% solids, zero VOC, two-component epoxy sealer/primer and polymer additive for high-early strength cementitious repairs.  VersaProof™ Primer EWB is a penetrating primer/sealer, uniquely formulated to reduce outgassing and improve adhesion.  VersaProof™ Primer EWB is ideal for damp concrete substrates, or substrates where trapped moisture and/or high moisture vapor drive is expected, such as split slab construction, or with stay-in-place forms.

VersaProof™ Primer EWB is typically thinned by 50% with water and may be applied at temperatures greater than 40°F by airless or air-assisted spraying, brush, roller, or squeegee.  VersaProof™ Primer EWB may be used with all VersaRoof™ rapid curing sealants and coatings for interior and exterior applications.


  • Unique water-born formulation
  • Improves adhesion
  • Easy, pre-measured kits
  • Excellent reduction in vapor drive and pin-holing
  • Designed to be used over damp concrete
  • Proven reduction in Moisture Vapor Emission
  • Safe over or around a variety of substrates
  • Polymer additive for high-early cementitious repairs

Physical Properties

Property Test Method Typical Value
VOC (Undiluted) Theoretical 0 g/l
Solids Content (Undiluted) Theoretical 0%
Pot Life2 Internal 30 minutes
Working Time2 Internal 45 minutes
Adhesion to Concrete1 ASTM D7234 > 200 psi
  1. Concrete prepared in accordance with SSPC-SP13/NACE No. 6.
  2. Tested at 77°F