PLASTER Additives

Grippon is an acrylic based liquid primer specifically formulated to improve the bonding of sand/cement plasters and gypsum plasters to previously painted, plastered and concrete surfaces. Can also be used as a bonding coat when applying weber.plast Colour Silk and weber.cote Brush Coat to gypsum board and previously painted surfaces. Produced from carefully selected raw materials for consistency of product, it is supplied ready for use.


  • Use weber.prim Grippon as part of the surface preparation when applying:
  • Gypsum plaster to previously painted surfaces.
  • Gypsum plaster to concrete surfaces.
  • Weber Colour Silk to Rhinowall.
  • Weber Brush Coat to previously painted surfaces.

weber.prim Grippon is suitable for use on surfaces like:

  • Cement-based plaster
  • Concrete
  • Gypsum board
  • Fibre-cement

Features and Benefits

  • Exceptional and consistent quality.
  • High bonding strength.
  • Plaster bonding agent.
  • Suitable for interior and exterior use.


When stored, unopened in a dry place at temperatures above 50ÂșC, shelf life is 12 months from date of manufacture. Replace the lid after use.

Surface Preparation

Ensure that all surfaces are clean, dry, sound and free from dust, grease or any contamination that could impair bonding. Organic growth must be removed and the spores killed using an effective fungicide like Mould Remover. Oil or grease should be removed using a cleaning agent and rinsed well with clean water.


weber.prim Grippon is supplied ready for use. Do not add water.


  • Please note that the final coat of weber.prim Grippon must always be wet/tacky when the plaster is applied. If in any doubt about the absorption of the surface, conduct a small bond test to establish the correct treatment.
  • Surfaces with average absorption: apply one liberal coat of weber.prim Grippon using a brush or roller.
  • Surfaces with high absorption: apply two liberal coats of weber.prim Grippon. Let the first coat dry completely before applying the second coat.
  • Surfaces with very high absorption: wet down well with water and apply two liberal coats of weber.prim Grippon. Let the first coat dry completely before applying the second coat. Wash brushes and rollers in clean water after use.


  • Depending on the nature and evenness of the surface and method of application, approximately 9 m2 per litre per coat.