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Everflex Primer WBPVendor:
Everflex Primer WBP is a water-based, penetrating acrylic primer for porous concrete, screeds, cement render, brickwork and fibre-cement surfaces. It controls surface absorption and improves the bond of compatible waterproofing membranes, tile adhesives and levelling compounds.Choose WBP when the substrate is absorbent and needs...- From $48.26
- From $48.26
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Everflex Polyurethane SupaprimeVendor:
Everflex Supaprime is a single-part, moisture-curing polyurethane primer for porous concrete, masonry, render, cement sheet and compatible timber surfaces. It helps improve adhesion before specified polyurethane, Hi-Flex MS polymer and silicone sealants, as well as selected Everflex waterproofing membranes.Choose Supaprime when porous construction materials...
- $59.51
- $59.51
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Sika Primer-3 N Epoxy PrimerVendor:
Sika Primer-3 N is a single-component, solvent-based epoxy primer that helps compatible Sika sealants and adhesives bond to porous construction substrates and selected metals. Use it where the specified Sikaflex, SikaHyflex, SikaBond, Sikasil or SikaSeal system requires this primer.Priming concrete and metal jointsSika Primer-3...- From $71.45
$0.00- From $71.45
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Ardex Multiprime PrimerVendor:
ARDEX Multiprime is a quick-drying water-based primer for porous building substrates. It helps compatible ARDEX waterproofing, tiling and construction products bond consistently to prepared concrete, cement render, screeds, masonry, lightweight concrete blocks and fibre-cement sheet.Why choose Multiprime?Porous substrates can absorb water unevenly and compromise...- $301.48
- $301.48
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Gripset GP PrimerVendor:
Gripset GP Primer is a water-based bonding primer for porous concrete, masonry, screeds, render and suitable sheet surfaces before Gripset waterproofing membranes or tile adhesives. It helps control surface absorption and provides a consistent, sound base for the next layer. Choose the primer to...- From $87.36
- From $87.36
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Mapei Primer GVendor:
Mapei Primer G is a water-based synthetic resin primer for preparing absorbent building surfaces before compatible tile adhesives and floor levelling compounds. It is particularly useful on gypsum plaster and anhydrite, where directly applying a cementitious product without appropriate preparation can compromise the finished...- From $57.91
- From $57.91
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SILCOR® Primer BSVendor:
SILCOR Primer BS is a fast-drying, single-pack modified polyurethane primer for prepared concrete, masonry, fibre-cement sheet and other compatible rigid substrates before SILCOR polyurethane waterproofing membranes. Prepare dry surfaces for SILCOR membranes Use Primer BS on sound, clean substrates with a moisture content no...- $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.