Casein primer

KREIDEZEIT Casein Primer is a versatile, colourless, transparent primer for subsequent coats of paint and thin-layer plaster applications with KREIDEZEIT casein, lime and clay paints and plasters for interior use. The binder is milk casein.

It does not reduce the vapour absorption of the substrate and is therefore particularly suitable for clay and lime plasters. A test area is required beforehand for the transparent consolidation of clay plasters.

Properties

• Powder for mixing with water, colourless and transparent
• reduces and evens out the absorbency of the substrate
• consolidates slightly sanding substrates
• very good penetration, very economical in use
• highly vapour-permeable: sd value < 0.01 m (DIN EN ISO 12572)
• free from preservatives

Suitable substrates

Untreated, absorbent clay, lime, lime-cement and gypsum plasters, plasterboard, gypsum fibreboard, stone, concrete and absorbent existing coatings prior to renovation. Unsuitable: smooth, non-absorbent and permanently damp substrates.

Use & Application

Mixing: Add the 250 g bag to 3 litres of cold water while stirring, stir until free of lumps, leave to swell for approx. 30 minutes, stir again and dilute with a further 5 litres of water.

Application: Apply evenly and generously, but only as much as the substrate can absorb. Remove any wet, glossy excess with a cloth before it dries. Minimum application temperature 8 °C. Use mixed primer on the same day.

Drying: Can be overcoated after approx. 8 hours at 20 °C with paints and plasters based on slaked lime putty or casein.

Tools & cleaning: Good-quality natural-bristle façade and ceiling brushes – do not spray or roll. Clean tools immediately with water.

Technical data

Mix	250 g in 3 l water, then + 5 l
sd value	< 0.01 m (DIN EN ISO 12572)
Application temperature	≥ 8 °C
Drying	ca. 8 h (20 °C)
Application	apply by brush, do not roll/spray

Full declaration

Casein, soda. Always observe the full product information (Technical Data Sheet and Safety Data Sheet) when using this product.

Frequently asked questions

What do I need the primer for?
It evens out substrates with differing absorbency, consolidates slightly powdery surfaces and ensures an even paint finish, without reducing vapour permeability.

Casein primer or Vega primer?
Both work in the same way. The Vega primer is vegan (plant casein), while the casein primer uses milk casein.

Can I roll or spray it?
No. Apply with a brush only and wipe off any excess.

How long does it need to dry?
Around 8 hours at 20 °C.