The surface to which the primer is applied must be solid, clean, and dry, free from grease and oil residues. The suitable substrates for BK-Deco Acryl are all surfaces leveled with BK-GletEx Universal or BK-GletEx Acryl. BK-Deco Acryl primer should be mixed and diluted with 10% water (0.1 l of water) before use. The primer is applied with a brush in a single layer, using cross motions to create additional texture. The primer drying time is a minimum of 6 hours. See the product data sheet for detailed instructions.