This phenomenon is called “chalking”. It concerns the formation of fine dust on the surface of the paint, due to aging resulting in intense fading of the paint on the wall.
- Excessive exposure to sunlight.
- Application on porous surfaces without priming.
- Excessive dilution, resulting in “slimming” the color.
- Application of plastic paint on the exterior surface or use of low quality paint.
Determine how intense the effect is by rubbing the surface with a black piece of cloth or by hand.
The following repainting procedure is recommended:
CASE A: If it is found that the surface is still dusty:
- Removal of the surface dust of the paint by rubbing with a hard brush and rinsing well with water. After the surface is dry, the control is performed by rubbing it by hand.
- Priming with the alkyd solvent primer RUST OFF by MARMOLINE.
- After the primer dries, MARMOLINE SUPER PAINT is applied in two coats.
CASE B: If it is found that the surface does not emit any more dust:
- Removal of the surface dust of the paint by rubbing with a hard brush and rinsing well with water. After the surface is dry, the control is performed by rubbing it by hand. In this case no priming is needed.
- Apply MARMOLINE SUPER PAINT in one coat.