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Everflex Primer WBPVendor:
For porous wall and floor substrates prior to tiling, levelling, or waterproofing, Everflex Primer WBP is a water-based, penetrating acrylic primer designed to seal the surface, enhance adhesion, and prevent blistering and pinholes in subsequent coatings. What it does Everflex Primer WBP penetrates porous...- From $48.26
- From $48.26
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Everflex Polyurethane SupaprimeVendor:
Everflex Polyurethane Supaprime is a porous substrate primer for caulking, civil construction, and waterproofing. One litre covers 5 to 10 square metres depending on porosity, and its very low viscosity sinks deep into concrete, masonry, and timber to give sealants and membranes a stable,...
- $59.51
- $59.51
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Sika Primer-3 N Epoxy PrimerVendor:
For sealing and bonding jobs on porous surfaces or metals, Sika Primer-3 N Epoxy Primer is the single-component, solvent-based primer required to prepare the substrate before applying Sikaflex, SikaHyflex, SikaBond, or Sikasil adhesives and sealants. Adhesion promotion mechanism The primer functions as an adhesion...- From $71.45
$0.00- From $71.45
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Ardex Multiprime PrimerVendor:
For porous substrates including CFC sheet, concrete, masonry, and jointing compound over plasterboard, ARDEX Multiprime prepares the surface to improve the adhesion of subsequent approved ARDEX products. This water-based liquid primer dries quickly in both internal and external applications, providing a reliable bond interface...- $301.48
- $301.48
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Gripset GP PrimerVendor:
For porous building substrates where preparation is required before waterproofing or tiling, GP Primer consolidates the surface and stabilises porosity. It forms a high-adhesion bonding key across porous materials, ensuring that Gripset waterproof membranes and tile adhesives adhere reliably without premature water loss into...- From $87.36
- From $87.36
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Mapei Primer GVendor:
When tiling over gypsum plaster, pre-cast gypsum panels, or anhydrite screeds, Primer G prevents the chemical reaction between substrate sulphates and cementitious adhesives. By isolating these incompatible materials, it stops the formation of ettringite crystals, which otherwise cause the tile adhesive or smoothing compound...- From $57.91
- From $57.91
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SILCOR® Primer BSVendor:
SILCOR® Primer BS is GCP's fast-drying, single-pack modified polyurethane primer for compatible SILCOR polyurethane waterproofing membranes. It is designed for dry, prepared construction substrates and provides the bond between the substrate and the liquid-applied membrane. Where SILCOR Primer BS fits GCP specifies Primer BS...- $299.29
- $299.29
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Frequently Asked Questions
What is the difference between a porous and non-porous substrate primer?
Porous substrate primers penetrate into absorbent surfaces such as concrete, brick, and masonry. Non-porous primers create a mechanical or chemical key on smooth surfaces such as glass, metal, and existing tiles. Always match the primer to the substrate type.
Can I dilute a porous substrate primer with water?
Most porous substrate primers apply neat. Mapei Primer G is the exception and accepts dilution from neat to one part primer to three parts water depending on the substrate. Check the product data sheet before diluting any primer.
How long after priming can I apply the next layer?
It varies by product. Most porous primers dry in 15 to 60 minutes. Bostik N49 has a four-hour overcoating window. RLA Rendergrip A has an eight-hour window. Silcor Primer BS allows up to 24 hours before overcoating.
Does a porous substrate primer stop moisture rising through the slab?
No. Porous substrate primers improve adhesion for membranes, adhesives, and toppings. They do not block moisture vapour transmission. For rising damp or hydrostatic pressure, use a moisture-barrier primer such as the Ardex WPM 300 or Gripset E-60 epoxy system.
Which porous substrate primer has the lowest VOC?
Mapei Primer G has zero VOC and carries the EC1 Plus certification. Ardex WPM 265 has 11 g/L. Everflex WBP has less than 16 g/L. Duram WB Primer has less than 20 g/L. All four are water-based products.