Home Problems & Solutions The paint does not cover, or cracks in patched areas Interior Wall Painting CausesUse of low quality putty ('paraffin') or the stocked areas have not been primed.Insufficient preparation (drying, sanding) of the stocked areas before priming and painting.SolutionSand and clean the problematic areas to remove old putty, apply KRAFT SPACHTEL acrylic putty.Let it dry.Then sand, clean the surface and prime with DUR AQUA.Finally, apply two coats of MASTER or MASTER ECO.