Primer spreads less than paint, and the surface changes the number. Pick what you are priming to get gallons.
How it works
Area × coats ÷ coverage, with coverage set by the surface. Porous and stained surfaces use the lower figures.
Before you order
- Use a drywall primer on new board so joint compound and paper take the topcoat evenly.
- Spot prime patches, then prime the whole wall if the color is changing a lot.
- Tint primer toward the topcoat for deep colors.
Common questions
How far does primer go?
Typically 200 to 300 sq ft per gallon, and up to about 400 on some drywall primers. Porous surfaces are at the low end.
Can I skip primer with paint-and-primer products?
On a sound, previously painted wall, often yes. On bare drywall, stains or raw wood, use a real primer.