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Everflex VBS Water-based Epoxy PrimerVendor:
For sealing green concrete, priming damp substrates, or blocking rising damp, Everflex VBS Water-based Epoxy Primer provides a high-density moisture barrier. This two-part water-based epoxy controls negative hydrostatic pressure up to a 25-metre head of water, preventing moisture migration from destroying timber flooring, polyurethane...- $440.44
- $440.44
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Megapoxy 154Vendor:
For treating damp surfaces, masonry, and green concrete, Megapoxy 154 is a two-component water-based epoxy designed to prime, seal, and provide a moisture barrier before laying down floor finishes or secondary membranes. It cures to a matte, chemical-resistant coating that tolerates foot traffic and...- $700.00
- $700.00
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Gripset Xpress Primer H2O Plus PrimerVendor:
To prevent waterproofing membranes and topical coatings from blistering or delaminating over damp or green concrete, Xpress Primer H2O Plus Primer forms a single-component vapour barrier that locks down residual substrate moisture. Unlike traditional epoxy vapour barriers, this water-resistant primer stops moisture without altering...- $389.93
- $389.93
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Gripset E-60 Epoxy PrimerVendor:
For damp or green concrete, masonry, and mineral substrates where residual moisture exceeds maximum allowable limits, Gripset E-60 Epoxy Primer serves as a water-based epoxy vapour barrier, moisture barrier, and high-adhesion primer. It prevents moisture penetration, rising damp, and efflorescence prior to the application...
- From $106.24
- From $106.24
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RLA Moisture Seal PrimerVendor:RLAFor subfloors and walls showing signs of rising damp, or green concrete slabs that need immediate coating, RLA Moisture Seal Primer acts as a two-part water-based epoxy barrier to block moisture vapour transmission and prevent subsequent floor finishes from blistering, bubbling, or delaminating. It...
- $459.03
- $459.03
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EPOCOTE™ F100W Epoxy Primer – Clear or GreyVendor:
EPOCOTE™ F100W is GCP's two-part, water-based epoxy primer and sealer for concrete and other compatible construction substrates. This Adheseal listing includes Clear and Grey variants, which GCP positions differently within SILCOR® waterproofing systems. Clear or Grey? EPOCOTE F100W Clear: the general-purpose clear primer/sealer used...- From $471.81
- From $471.81
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Frequently Asked Questions
What is the difference between a moisture-barrier primer and a regular primer?
A moisture-barrier primer blocks water vapour and hydrostatic pressure from the substrate. A regular primer improves adhesion only. Moisture-barrier primers use two-part epoxy chemistry and need a minimum dry film thickness to perform.
Which moisture-barrier primers resist hydrostatic pressure?
Ardex WPM 300, Gripset E-60, RLA Moisture Seal, and Everflex VBS all resist hydrostatic pressure up to 25 metres of water head. Gripset H2O Plus and Mapeproof 1K Turbo manage vapour transmission only and are not rated for hydrostatic conditions.
Can I use a single-component moisture-barrier primer?
Yes. Mapeproof 1K Turbo is a single-component polyurethane that tolerates substrates up to 95% relative humidity. Gripset H2O Plus is another single-component option with a colour-change drying indicator. Both suit vapour control but not hydrostatic pressure.
How thick does a moisture-barrier primer need to be?
Most two-part epoxy moisture-barrier primers need 300 microns dry film thickness across two coats. The first coat often accepts water dilution for penetration on porous substrates. Sand-seed between coats for tiling or screeding over the barrier.
Are any moisture-barrier primers trafficable?
Yes. Megapoxy 154 is the only trafficable moisture-barrier primer here. It supports foot traffic and light vehicles once cured. It is a two-part epoxy that also works as a dust sealer. It does not bridge cracks and yellows under UV.