
- Use of an interior paint for exterior application.
- Over thinnning of paint.
- Not properly sealing a porous surface before painting.
- Remove as much of the chalk residue as possible, using a stiff bristle brush and rinse throughly with a garden hose; or use power washing equipment.
- Check for any remaining chalk by running a hand over the surface after it dries.
- Apply a quality primer before repainting.