Why is the paint patchy – darker or lighter – in some places?
What is it?
Patchiness is when the paint does not present a uniform colour and smooth appearance. The thickness and intensity of the film varies in different portions of the wall.
Possible Causes:
Application of finish coat over puttied surfaces Incomplete drying of putty.
Painting over a highly alkaline surface, which is usually evident in new walls.
Application of thick coat of putty.
Solutions:
Allow new walls to cure for thoroughly. For already painted surfaces, scrape off old paint and prepare surface correctly.
Cracks in plaster should be filled with cement sand mixture.
Apply thin coats of putty.
