|New plastered surfaces should be allowed to mature for at least 8-10 weeks before applications of cement paint to achieve dryness & proper setting. Surface should be free form efflorescence (saltpeter) or algae & fungus at the time of application of cem-Paint. To treat efflorescence (saltpeter) on freshly plastered walls, apply on the affected surface 8-10% solution of hydrochloric(muratic) acid in water with a paint brush, leave it for 5-10 minutes or when bubbling on the surface stops, wash down the surface liberally with water (ensure adequate precautions and wearing of rubber gloves during this exercise). Algae & fungus can be treated by treating the infected area with either a fungicidal wash or by applying 4-5% solution in water of calcium hypochlorite (with approx. 35% chlorine content) or a household bleach, by brush, leave it for 24 hours, wash liberally with clean water and stiff wire brush and allow it to dry.
All surfaces where Cem-Paint is to be applied should be clean, stable, dry & free from any cracks, loose flaky coatings, algae fungus, grease, dirt, dust, distemper, lime etc.
Walls with multi coats of cement paint should be thoroughly scrapped with wire brush and washed with water before application of new coating of Cem-Paint. do not use sand paper.