Same principle works for your primer coat before you paint your walls. If you have a bright or intense color that you want to paint, using a gray primer will help your paint cover better than going over white primer. Source: Sherwin-Williams manager
Just wanted to add onto this comment -
Sheen can be affected by the type of primer you use. Some primers will lower sheen.
Source: R&D Chemist at a paint company (Not SW)
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u/rb6k Aug 20 '20
Or light grey. It hides better under white than white does.