Again, as with exterior painting, the preparation of the surface is of prime importance. Far too often this is neglected and results are disappointing.
Before starting to paint, wash or scrape off all calcimine, loose paint, grease and dirt. Fill (jracks with patching plaster and sand to a smooth surface. Touch up patched spots with first coater. Even though no spots or cracks need patching, wash the surface before painting. The work involved will be well worth while.