Product Description

Primer PU Fast is for consolidating and improving the characteristics of weak, crumbly or powdery surfaces. It is also suitable for outdoor use for consolidating the surface of concrete slabs, screeds, renders, bricks, sandstone, tuff, cement and lime-based decorative mortar.

Field of Application

· For treating gypsum surfaces before installing waterproofing products.

· As an anchoring coat for gypsum-based spray plasters.

· To improve bonding of smoothing compounds on cementations or anhydrite and gypsum-based surfaces.

· To provide uniform absorption in cementations or gypsum surfaces.

Product Details

Product identity

Consistency: liquid
Color: Light yellow
Density (kg/m³): 1200
Viscosity (mPa.s): 350
Dry solids content (%): 100


Primer PU Fast is supplied in:
– 1 kg plastic can
– 5 kg plastic can
– 10 kg plastic can


The consumption of PRIMER PU FAST depends on the porosity and absorption of the surface. Typical consumption is between 200 and 300 gr/m².

Application Procedure

Preparation of substrate

The substrate should be dry, clean, and free from grease, oils, residual paint, and other loose material. In each case, the manufacturer’s recommendations for gypsum-plaster must be followed, particularly as far as moisture content and level of surface finishing are concerned. Cracks in concrete surfaces must be repaired with Epoinject. Anhydrite surfaces must be sandpapered.

Preparing the product

Ready to be used.

Applying the product

Stir the PRIMER PU FAST before use; spread it uniformly on the surface with a flat brush or roller without diluting it. If the gypsum plaster surface is particularly smooth and glossy, it is recommended to rub it beforehand. Once it has dried, install the tiles.