What is the main purpose of primer when painting an interior wall?
A. To act as a sealant to prepare the surface for a new coat of paint B. So paint companies can make more money by selling more products C. It allows you to cover up a dark coloured wall with a lighter colour with less coats of paint.
W. Wright, Biology student, Biology student, Astoria
Answered on Feb 28, 2019
A primer will indeed help to cover a dark wall when a lighter colour is to be applied. After two coats of primer, a dark teal colour, for instance, may now have a pale yellow painted with no advere effect. But a primer is a required preparation for the painting of any surface. A primer will prevent the absorption of subsequent layers of paint or the development of rust.