Fosroc Primer No. 21 250ml Sealers & Hardeners High-build formulation – ideal for

High-build formulation – ideal for vertical and overhead repairs

Keep your rebar perfectly positioned with our Wire Bar Chairs (280mm

Dual expansion system – provides excellent control of plastic and drying shrinkage

Below-grade waterproofing where fast application and long-term performance are required

Fosroc Primer No. 21 250ml Sealers & Hardeners High-build formulation – ideal forFosroc Primer No. 21 is a single component, solvent based polyurethane primer used to prepare dry concrete joints prior to the application of Nitoseal polyurethane sealants, including Nitoseal PU250 and PU400. Supplied in a convenient 250ml container, Primer 21 is ideal for smaller jobs or touch up applications. It promotes excellent adhesion to dry, clean concrete surfaces and is not recommended for areas subject to long term dampness or permanent