Casein Primer


Multi-purpose, colourless transparent primer for subsequent coats and thin-layer plastering with Kreidezeit Casein paints, lime paints and plasters.

Kreidezeit Casein primer has no reducing effect on the vapour absorption of plasters (sD value < 0.01 m) and is therefore an ideal primer, especially for clay and lime plasters.
Suitable for use on all untreated substrates such as clay, lime, lime-cement, gypsum plasters, gypsum plasterboard and gypsum fibre boards, stone, concrete. Recommended for priming absorbent old paints before renovation: e. g. Kreidezeit caseinpaints, claypaints, lime paints and emulsion paints..
Not suitable for all smooth, non-absorbent surfaces and permanently moist substrates.
For transparent solidification of plasters, especially clay plasters indoors; here it is necessary to create test areas (see chapter “Tips”).

The use of casein primer within the different Kreidezeit paint and plastering systems is described in the corresponding product information.



  • Powder for mixing with water
  • Reduces the absorbency of highly absorbent substrates and compensates different absorbencies of the substrates.
  • Solidifies slightly sandy substrates.
  • very good penetrating power
  • colourless, transparent
  • easy to process
  • very economical
  • highly diffusible.
  • free of preservatives
  • paint residues are compostable


Full Declaration

Casein, sodium carbonate

When using the product, the complete product information casein primer must be observed.

Mixing the Casein Primer
For mixing the casein primer, it is best to use a 10 litre bucket and an agitator (drilling machine + whisk).
Add the casein primer (250 g) to 3 litres of clean cold water while stirring constantly. Make sure that all the lumps are mixed. After an expanding time of approx. 30 minutes, stir again thoroughly and dilute with 5 litres of water.

Apply casein primer evenly and saturated.
Only apply as much liquid as is absorbed by the substrate.
Remove excess material (wet glossy spots) with a cloth before drying.
Application temperature min. 8°C.
The Primer must be applied on the same day as mixing. Do not use Primer that smells bad or rotten under any circumstances: Danger of prolonged odour problems even after drying!

Drying Times
Dried after approx. 8 hours at 20°C and safe to coat with paints or plasters based on lime or casein.

Suitable Tools
Facade and ceiling brushes. Do not spray or roll casein primer.

Product Information Casein Primer

Material Safety Data Sheet Casein Primer

For the transparent solidification of clay and other plasters without subsequent application of paint, we recommend our Wall Glaze Binder. You will find detailed instructions on how to proceed in the corresponding product information.

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Please do not hesitate to contact us if you have any further questions.