Waterproofing over challenging non-porous surfaces like glazed tiles, metals, or dense timbers no longer demands harsh etchants or compromised bonds. Gripset Xpress SP delivers secure, solvent-free adhesion for Gripset waterproofing systems on these difficult substrates. It brings the same enhanced bonding performance to standard porous surfaces, streamlining primer selection across diverse project demands.

Why this product exists

Gripset Xpress SP was formulated to bridge the gap between demanding non-porous and dense substrates and the need for robust, reliable adhesion for Gripset liquid and self-adhesive membrane systems. Traditionally, achieving strong bonds on surfaces like existing glazed tiles, metal flashings, or dense precast concrete often required aggressive solvent-based primers or surface etching. This product provides a safe, solvent-free alternative that enhances adhesion across a wide spectrum of materials, including general porous surfaces, without compromising bond strength.

The numbers that matter

• Adhesion strength: Achieving >1.23 MPa on concrete and 0.83 MPa on glazed tiles demonstrates high bond performance even on difficult non-porous surfaces. This ensures the subsequent waterproofing system adheres securely, resisting delamination under typical service conditions.
• Drying time: A 30-minute drying time at 23°C and 50% RH allows for rapid turnaround on site, reducing waiting periods between priming and membrane application. This quick set minimises project delays without sacrificing bond integrity.
• VOC Content: With Nil VOC content, this primer supports Green Star ratings, offering an environmentally responsible choice for projects requiring low-emission materials. It contributes to healthier indoor air quality without off-gassing.

What it's like to use

Applying Gripset Xpress SP is straightforward, primarily with a low-nap roller or long-bristle brush, ensuring even coverage. Its low dirt retention keeps primed surfaces clean until membrane application. When wet, tools and hands clean up easily with water. If dried, mechanical removal or solvent is required for tools, while solvent-free hand cleaners address cured product on skin.

Where this product excels

This primer finds its strength in demanding waterproofing scenarios where conventional primers struggle or are unsafe:

• Balconies, podiums, and flashings: For priming challenging substrates like metals, precast concrete, or glazed surfaces before applying Gripset membranes in external, exposed areas.
• Internal wet areas: Provides critical adhesion for waterproofing systems over existing ceramic or vitrified tiles, dense timber boards, or compressed cement sheeting in bathrooms, laundries, and kitchens.
• Over existing finishes: Ideal for renovation projects where waterproofing must bond to non-porous surfaces like old tiles or glazed finishes without requiring their removal or etching.
• Complex details: Priming around door/window reveals and intricate flashing details where precise, high-performance adhesion is critical for leak prevention.

How it fits in a real system

Gripset Xpress SP frequently acts as a secondary adhesion promoter within complex waterproofing systems, often applied after a general-purpose primer like Gripset GP Primer. This layered approach ensures optimal bonding on multi-surface applications, particularly for projects involving both porous and non-porous elements. It precedes the application of Gripset liquid membranes such as Gripset BRW PF or Gripset 38FC, and is used with prefabricated corners to complete the waterproofing envelope.

Choose this when

• When priming non-porous substrates: For metals, existing glazed tiles, dense timbers, or rigid plastics where strong adhesion is paramount for subsequent Gripset membranes.
• When a solvent-free solution is required: For projects demanding safe application conditions and low VOC products, avoiding the hazards of solvent-based alternatives.
• As a secondary primer in multi-substrate systems: After a general porous primer like Gripset GP, to ensure enhanced adhesion on diverse challenging surfaces within the same waterproofing zone.
• For rapid application: Its 30-minute drying time supports efficient project timelines, especially in fast-paced commercial or residential fit-outs.

Don't use this when

• Not for: Areas subject to rising moisture or negative hydrostatic pressure; these conditions demand dedicated moisture barrier primers.
• Not for: Immersed applications, such as internal ponding areas or water features, where continuous water contact requires specific waterproofing systems.
• Not for: Acting as the sole primer for general concrete. For broad concrete priming needs, consider Gripset GP Primer.
• Not for: Primary metal priming where a dedicated metal primer like Gripset OP Primer might offer specific anti-corrosive or enhanced properties for critical metal-only applications.

Choosing between Gripset Xpress primers

While some primers rely on dangerous solvents or etching to achieve bond on challenging surfaces, Gripset Xpress SP offers a solvent-free alternative for superior adhesion on non-porous, dense, and smooth substrates, along with porous surfaces. When the job primarily involves standard porous concrete or masonry, Gripset Xpress Primer H2O Plus is a fit-for-purpose water-based primer. However, for diverse substrate conditions, particularly those including non-porous surfaces like metals or glazed tiles, Xpress SP's broader adhesion profile and solvent-free formulation simplifies selection and enhances safety. For cementitious repairs or bonding agents, Gripset 11Y Primer serves a distinct function.