1 part waterproofing, primer

PRIMER FOR CONCRETE AND CEMENTITIOUS SUBSTRATES

Description Sikalastic® U-Primer is a solvent-based, one component primer.
  Uses Sikalastic® U-Primer may only be used by experienced professionals.
Sikalastic® U-Primer is designed to prime concrete and cementitious substrates prior to the application of Sikalastic®-632 R.