Primers
There are two types of primers — sealing primers and deep base primers.
Sealing primers: Depending on the state of the wall — for example, if there’s already a dark coloured paint on it or lots of staining— you may need to seal the surface with primer before you paint. Primers come in water- and oil-based varieties. Oil-based primer can be used with any paint, but do not use water-based primer under oil-based paint.
Deep Base Primers: These are specifically made for use with saturated, dark colours, to help reduce the number of coats necessary to achieve the full depth and richness of hue. These will save both time and money on the project.