When preparing dry, porous substrates for waterproofing or tiling, the adhesion of subsequent layers is critical. Gripset GP Primer ensures this bond, creating a stable, dust-free surface ready for Gripset membranes and adhesives. It provides peace of mind that the system's foundation is sound, right from the start.

Why this product exists

Gripset GP Primer is specifically formulated to prepare dry, porous surfaces, ensuring optimal adhesion for Gripset waterproof membranes and tile adhesives. It addresses the common site challenge of inconsistent porosity and dusting on substrates like concrete, screed, masonry, and compressed fibre cement sheeting. By sealing the surface and promoting a strong bond, it eliminates the risk of membrane or adhesive failure due to poor substrate preparation.

The numbers that matter

The performance of any waterproofing or tiling system begins with a reliable primer. Gripset GP Primer provides the critical foundation through these key properties:

  • Fast Drying: With a 30-minute dry time at 23°C and 50% RH, this primer minimises project delays. Trades can apply membranes or tile adhesives quickly, improving site efficiency.
  • Economical Coverage: A single litre covers 8-10m² per coat, offering efficient use and reducing material costs for large areas. Coverage rates will vary with substrate porosity.
  • Visual Confirmation: The primer applies milky white and dries clear, providing a visual indicator of complete coverage before subsequent layers are applied.

What it's like to use

Gripset GP Primer is straightforward to apply. It is used neat, without dilution, and can be spread quickly by brush or a medium nap roller. For highly porous or dusty surfaces such as aerated concrete or aged screeds, a second coat may be necessary to achieve a stable base. The primer must be fully dry before applying any subsequent finishes. Tools clean up easily with water while wet.

Where this product excels

  • Balconies and Podium Decks: Ideal for preparing external concrete slabs and screeds, enhancing adhesion for waterproofing membranes on areas exposed to the elements.
  • Internal Wet Areas: Forms a critical bond for Gripset membranes and tile adhesives in bathrooms, laundries, and kitchens, particularly on plasterboard and compressed fibre cement sheeting.
  • Civil Structures: Effective for priming concrete and masonry on retaining walls, lift pits, and other civil applications where a reliable bond for subsequent coatings is essential.

How it fits in a real system

As a foundational component, Gripset GP Primer is typically the first step in many Gripset waterproofing and tiling systems. On balconies and podium decks, it prepares the substrate before an additional non-porous primer like Gripset OP Primer may be applied to specific details. In internal wet areas, it creates the initial bond for subsequent products like Gripset Xpress SP Primer, followed by the main waterproofing membrane such as Gripset 38FC and tile adhesives. Its role is to ensure the entire system has a stable, high-adhesion base.

Choose this when

  • When preparing dry, porous substrates like concrete, screed, masonry, plasterboard, or compressed fibre cement sheeting.
  • When you need to enhance adhesion for Gripset waterproof membranes or tile adhesives in both internal and external areas.
  • When the substrate is prone to dusting or has variable porosity, requiring a surface stabiliser and bond promoter.

Don't use this when

  • Not for: Substrates with active moisture, high residual dampness, or rising damp; for these conditions, refer to Gripset E60 or Gripset Xpress H20 Primer Plus.
  • Not for: Non-porous surfaces; this primer is specifically formulated for porous materials.
  • Not for: Application when temperatures are below 5ºC or above 35ºC, or when rain is imminent.

This product is classified as a non-hazardous chemical according to its Safety Data Sheet (SDS). Users should always refer to the SDS for safe handling and disposal instructions.

Choosing the Right Gripset Primer

Gripset offers a range of primers, each formulated for specific substrate conditions. Gripset GP Primer is your choice for dry, porous substrates such as concrete, screed, and masonry, where it enhances adhesion for subsequent Gripset membranes and adhesives. In contrast, for substrates presenting dampness, high residual moisture, or active rising damp, the correct choices are Gripset E60 or Gripset Xpress H20 Primer Plus, both engineered to manage moisture. Furthermore, when dealing with non-porous surfaces that require enhanced adhesion, such as PVC penetrations or metal, Gripset OP Primer is typically specified.