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Waterproofing Primers and Pre-Treatments
Waterproofing primers and pre-treatments are essential first steps in any effective waterproofing system. Designed to stabilise, seal, and prepare surfaces, these products enhance the adhesion and performance of membranes, slurries, resins, and coatings. Whether you're working on a flat roof, basement wall, wet room, or terrace, using the correct primer ensures that your waterproofing system bonds securely and performs reliably over time - even in demanding conditions.
Mapei Mapethene Primer
Mapethene Primer is used as a primer for self-adhesive bitumen membranes from the Mapethene line. Ready to use Applied by brush, roller or spray Quick drying Solvent-free For professional use only. More Information Delivery Info
SikaProof Primer 01
SikaProof Primer 01 is solvent-dispersed synthetic rubber and resin based used as a primer for SikaProof waterproofing system to increase the adhesion and bond to the comply substrate. Features & Benefits High adhesion and bonding ability on various substrates Good binding ability for dust and loose particles Quick drying time,...
Fosroc Proofex Primer
Fosroc Proofex Primer is a primer for use on concrete, masonry and steel prior to application of waterproofing membrane on basements and below ground structures. For use with Proofex products in the Fosroc range. Please see the Product Data Sheet for the relevant base product for application and mixing details for Proofex Primer.
Sika CD Anti-Lime Coating
The Sika CD Anti-Lime Coating is a blend of high-grade silicates and wetting agents, held in suspension with water as a carrier. Once applied to the concrete surface, this unique product seals the concrete surface. Reduce “Free Lime” leaching from concrete surfaces, an effective Anti-lime coating to new concrete in Cavity Drain systems....
Sikalastic 810
Sikalastic 810 is a two part, polyurethane adhesion promoting bonding bridge for overlapping or overcoating of Sikalastic waterproofing membranes when exceeding the maximum waiting time. Good adhesion on flexible PUR coatings Contains no solvents Fast curing Low material consumption Sprayable More Information Delivery Info
Sika BituSeal Primer
A bitumen solution primer to be used in conjunction with Sika BituSeal S-115 to increase adhesion and bond to the substrate. High adhesion and bonding ability on various substrates Good binding ability for dust and loose particles Ready to use by brush, roller or spray Order a Paint Colour Sample
Fosroc Proofex Anti-Lime Coating
Fosroc Proofex Anti-Lime Coating is a water based blend of high performance silicates and wetting agents. When applied to concrete surfaces, a reaction with free lime occurs to provide an effective seal Reduces subsequent leaching of lime into Proofex Cavitydrain installations. Please Note: This product is subject to a 14-21 Working Day...
Mapei Purtop Primer FT
A two-component ultra-rapid polyurea primer for treating cementitious substrates before applying waterproofing membranes from the Purtop range. Rapid-curing: 30 minutes (at +23°C and 50% R.H.) Easy to apply with a roller, trowel or rake For professional use only More Information Delivery Info
Mapei Plastimul Primer
Mapei Plastimul Primer is a one-component, solvent-free, bitumen emulsion primer for treating substrates before applying a waterproofing product from the Plastimul range. Even out and improve bonding to the substrate before applying waterproofing products Good workability properties, produced according to a formula developed in MAPEI’s own...
Mapei Plastimul C
Mapei Plastimul C is a solvent-free concentrated bitumen emulsion for treating substrates before applying waterproofing products from the Plastimul line. Used to even out and improve their adhesion to the bonding surface on concrete or brickwork substrates (vibro-compressed concrete blocks, solid bricks, airbricks, cellular concrete blocks,...
Visqueen CM Anti-Lime Sealer
Applied to concrete surfaces prior to the installation of a Visqueen cavity membrane system to prevent the leaching of free lime from the concrete substrate. An anti-lime sealer for concrete - reduces risk of cavity membrane system furring up Rapid application - can be applied by brush, roller or spray Concentrated formulation diluted on...
Visqueen High Performance Tanking Primer
Used to prepare a variety of substrates including concrete, metal and masonry. It significantly improves the bond of the applied membrane. Designed to prepare surfaces prior to the applications of Visqueen self adhesive membranes and Visqueen TorchOn Tanking Membrane No mixing required - use straight from the tin Rapid cure - quick and...
Eagle Ultra Dry Epoxy Resin
2-component, solvent-free epoxy resin for moisture control. Can be used on concrete, mortar, screed, swimming pools, balconies, and tanking applications. Absorbs moisture from wet substrates and reduces waiting times for construction projects. Resistant to positive and negative pressure up to 10 bars (refer to test certification)....
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Waterproofing Primers & Surface Pre-Treatments for Roofs, Basements, Wetrooms & More
When it comes to waterproofing success, preparation is just as important as the final coating. Waterproofing primers and pre-treatments are designed to improve substrate integrity, reduce absorbency, and provide a stable base for membranes, paints, and waterproofing mortars. They help prevent common issues such as blistering, delamination, and premature failure - particularly on porous or dusty surfaces where standard coatings may struggle to adhere effectively.
Whether you're preparing concrete slabs, cement screeds, rendered walls, or previously coated areas, these products form a critical part of the waterproofing process. Some also provide early resistance to moisture or dampness, enabling application in less-than-ideal conditions. Others act as bonding agents for cementitious slurries or bituminous layers, creating a unified system that withstands pressure, foot traffic, and environmental exposure.
Waterproofing Primers & Pre-Treatments FAQs
Do I need a primer if my surface looks clean and solid?
Yes, even surfaces that appear clean may be too porous or too smooth for proper adhesion. Primers help seal and stabilise the surface, ensuring a consistent bond and reducing the risk of failure. Without a primer, coatings can dry unevenly or peel over time, especially on absorbent or contaminated substrates.
Can waterproofing primers be used on damp surfaces?
Some primers are specifically formulated to tolerate damp or green substrates. These are ideal for newly poured concrete or areas where full drying isn’t possible. However, standard primers often require dry conditions, so always check the product instructions before application on damp surfaces.
What’s the difference between a primer and a pre-treatment?
Primers are typically used to enhance adhesion and seal the surface. Pre-treatments may include salt-inhibitors, bonding agents, or moisture blockers designed for specific substrate challenges. While primers prepare for bonding, pre-treatments often target contaminants or structural issues before sealing begins.
Can I use the same primer under any type of waterproofing system?
No, primers must be compatible with the system they’re used with. For example, a primer for bitumen-based membranes differs from one used under polyurethane or cementitious coatings. Always choose a primer specified by the waterproofing product manufacturer to ensure proper chemical bonding.
How long should I wait after priming before applying a waterproofing membrane?
Drying times vary by product and site conditions. Some fast-drying primers may be ready for overcoating in 30–60 minutes, while others may require several hours. High humidity and low temperatures can extend cure times, so always follow the product’s technical guidance before applying subsequent layers.