What type of primer should I use for new drywall?

For new drywall, use a high-build latex primer or PVA (polyvinyl acetate) primer. These primers seal the porous drywall surface and provide uniform paint absorption. Coverage is typically 350 sq ft per gallon.

Do I need primer on previously painted surfaces?

Yes, primer is recommended when changing paint types (oil to latex or vice versa), painting over dark colors with light colors, or when the existing paint is glossy or in poor condition. Use a bonding primer for best adhesion.

How many coats of primer do I need?

Most surfaces require one coat of primer, but heavily stained surfaces, bare wood with tannins, or dramatic color changes may require two coats. Always allow full drying time between coats.

Can I use paint and primer in one instead of separate primer?

Paint and primer combinations work well on previously painted surfaces in good condition, but separate primer is recommended for new surfaces, stain blocking, or when making significant color changes for best results.

Back to CalculatorsSurface Preparation

Primer Calculator

Calculate primer coverage, costs, and materials for professional priming projects. Professional primer calculator for all surface preparation applications.

Calculator

Surface Area*

sq ft

Total surface area to be primed

Surface Type*

Surface type determines primer requirements and coverage rates

Surface Condition*

Surface condition affects primer requirements and coverage

Primer Type*

Primer type should match surface requirements and topcoat

Application Method*

Application method affects coverage rates and finish quality

Number of Coats*

Multiple coats provide better coverage and protection

Pro Tips

Use stain-blocking primer for water stains and knots
Choose bonding primer for glossy or slick surfaces
Apply rust-inhibiting primer on all bare metal
Use high-build primer for rough or damaged surfaces
Match primer type to topcoat compatibility
Clean and prepare surface before priming
Apply primer in thin, even coats
Allow full drying time between coats

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