The surfaces should be dry, clean and free from contaminates such as grease, oil, dust ...etc, which can result adhesion of the paint to the surface.
New Surfaces:
Clean the surface and apply one coat Master, apply one coat anti rust first on steel surface before Master.
Repainting:
Cement surfaces should be cleaned with water and soap, rinse thoroughly with water to insure the surface is free from all contaminates then allow the surface to dry well from flakes or defect painted surface, use a sanding paper to release it then apply previous item.
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