This matt blackboard paint from Talens Art Creation is suitable for all porous ground such as stone, wood, plastered walls, etc. The paint produces a strong surface that is resistant to wear. After 48 hours it is water resistant, allowing it to be wiped clean with a damp cloth. The paint flows very easily. This allows a very smooth surface to be created, which is highly suitable for drawing and writing on with chalk. 
Make sure the surface is grease free before application. 
No primer necessary. 
Paint 2-3 layers and let it dry for 30-45 minutes between each layer. 
Apply the paint with a soft flat brush or a smooth roller and clean it with warm water. 
Coverage: 7 m²/L.