Prep Coat Primer

Prep Coat Primer

Product Info

Prep Coat Primer is a unique multipurpose 2 in 1 primer and waterproofing additive. Prep Coat Primer is used as a primer for Gripset Betta membranes to enhance adhesion to general surfaces. As a waterproofing admixture Prep Coat Primer will improve the water resistance and adhesion of cement based compounds such as mortars, slurries, grouts and cement based adhesives.

Colour: Milky White

Sizes: 1Litre, 4Litre and 15Litre

Features & Benefits

As a Primer

  • Excellent adhesion over general building surfaces
  • Fast drying
  • Economical coverage of up to 1 Litre / 8 m²
  • Can be used as a paint and tile primer
  • Compatible with Gripset Betta membranes, tile adhesives, renders and water based acrylic paints

As an Additive

  • Improves water resistant and waterproof properties of cement based compounds
  • Fast drying
  • Enhances bond strength in areas subject to moisture, weather, immersion and over non porous surfaces
  • Improved crack, frost and salt resistance
  • Improved durability and reduces shrinkage
  • Prep Coat & Additive is water based, non toxic and solvent free

As a Primer

  • Used to enhance adhesion of Gripset Betta membranes
  • Enables improved coverage of membrane application
  • Tile, rendering and paint primer (acrylic paints only)

As an Additive

  • Waterproofing cement mortars, slurries, renders, grouts and cement adhesives
  • Increasing strength to renders and screeds
  • Mortar and concrete repairs in exposed and immersed areas
  • Patch and repair mortars

Prep Coat Primer

How To Use

Surface Preparation
Surfaces must be prepared thoroughly before commencing. Surfaces are to be sound, stable, dry and clean, free of loose foreign matter including any surface residues or existing coatings. Buildings are to be constructed to relevant building standards and manufacturer’s recommendations are to be followed for all building materials used. Suitable surfaces include:

  • Masonry and concrete
  • Marine ply and wet area timber sheeting
  • Cement sheet and wet area plaster board
  • Clay and concrete bricks
  • General porous surfaces
  • Existing acrylic coatings and Gripset Betta products

For non porous surfaces, smooth surfaces and non standard substrates refer to Super primer, Damp Stop primer or contact Gripset Industries.


As a Primer

  • For Gripset Betta liquid membrane applications apply product directly out of pail at coverage of 1 Litre/6–8 m². Do Not Dilute
  • On very porous surfaces or surfaces with weak surface strength, e.g. aerated concrete, asbestos etc. apply 2 coats of primer
  • When using as a tile or paint primer, dilute 1 part Prep Coat & Additive to 2 parts water, then brush/roll onto surface

As an Additive

  • Waterproof high bonding slurry coat, mix 1 part Prep Coat & Additive to 1.5 parts of cement and brush apply 2 coats
  • Water proof render/screed (0–10 mm thick), use a solution of 1 part Prep Coat & Additive to 1.5 parts water, then add to sand/cement compound
  • Water proof render/screed (greater than 10 mm thick), use a solution of 1 part Prep Coat & Additive to 2.5 parts water, then add to sand/cement compound
  • For a concrete mix, allow 250 mL of Prep Coat & Additive to every kilogram of cement and add water as required
  • Grouts and cement based adhesives, use a solution of 1 part Prep Coat & Additive to 1 part water into grout/cement adhesive mix

When using as an admixture, Prep Coat & Additive can be used in concentrated form to achieve optimum waterproof, adhesion and strength properties.

General Information

Drying time

Tack Free (primer usage)
Dry Film (ready for overcoat)
15–30 minutes
30–45 minutes
* Based on normal ambient conditions of 20ºC.
Temperature, humidity and porosity will vary dry times.
Note – When using as an admixture, drying will be based on cement content in compound.



  • Not to be used over wax/oily surfaces, steel, glass, fibreglass or plastic
  • When using for bonding agent applications, ensure sand is clean. Fresh Portland cement should be used, cool and free of lumps
  • If lime is used in mortar, ensure volume is no greater than 20% of cement. No air entraining agents should be used in the mortar mix
  • Not to be applied when surface temperature is below 10ºC or above 35ºC


  • Before commencing the application, adhesion of products to be used (primers, membranes, coatings) should be tested over a typical area of the prepared surface to ensure satisfactory adhesion
  • When using in a render/screed, this should be applied over a wet coat of Prep Coat & Additive slurry
  • When using as an admixture, mix with clean water. No other additives should be incorporated

Clean up

In water while wet. Once product is dried it needs to be removed mechanically or by solvent.


  • Best stored at room temperature
  • Avoid cold freezing conditions and off concrete floor
  • Do not store in direct sunlight
  • Shelf life is 12 months in original unopened container

Product Guarantee

The Gripset Betta Waterproofing System is guaranteed for 10 years when used to the full specification which requires correct surface preparation and correct usage of: primer, waterproof detailing products and membranes. Warranty is only offered when complete usage of products as specified has been achieved. The manufacturer is not liable and the warranty will also not apply to any defect or damage arising from site conditions, accessories not manufactured or approved by the manufacturer and any contamination in or modification of products or system. For full warranty terms and conditions, email [email protected]