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WHAT IS A PRIMER, AND WHY IS IT IMPORTANT? 

Primers are materials used as a preparatory coating to enhance adhesion of overlaying compounds. They regulate absorption rate of porous substrates and improve adhesion to non-porous materials. Uses of appropriate primers are necessary to ensure good bonding to these substrates. Failure to do so can lead to de-bonding of coverings.

POROUS SUBSTRATES

A porous or absorbent substrate will allow a bead of water to easily soak into and wet out the surface of the substrate.  Primer must be used prior to application to avoid pinholes.

  • UL Primer
  • Bostik Multiprime

Concrete that is overworked or burnished at the time of placement can become nonporous when cured. Mechanical abrasion, such as captive shot blasting or vacuumed grinding is required to open substrate pores prior to the application of a prime.

POROUS SUBSTRATE PRIMERS

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MULTIPRIME
  • Product

General purpose primer designed for use on porous surfaces. Fully compatible with Bostik tile adhesives and most Bostik waterproofing membranes. ...

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UL PRIMER
  • Product

Bostik UL-Primer is a high performance one component primer for use on porous substrates. A polymer modified formula designed for use with ...

NON-POROUS SUBSTRATES

A non-porous or impervious substrate will cause a bead of water to be retained on the surface of the substrate as a raised droplet. The droplet does not easily soak into the surface of the substrate. Prime Grip is an ideal general purpose primer. 

Bostik N40 is best for rigid plastic and metallic substrates such as uPVC drainage outlets & penetrations, aluminium angle water stops, brass tap bodies, copper or galvanised penetrations, stainless steel drains & gutters etc.

 

NON-POROUS SUBSTRATES PRIMERS

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N40 PRIMER
  • Product

Bostik N40 Primer is a clear, non-staining solvent-based primer/cleaner for promoting the adhesion of polyurethane sealants and waterproof ...

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PRIME GRIP
  • Product

A new generation of one component universal ready to use solvent free primer and adhesion promoter specifically designed to improve bonding onto ...