A Primer On Primers

BEST FOR Preparing previously finished surfaces, including drywall, concrete, fiber cement, stucco, metals, fiberglass, and PVC.

PROS Low odor; fast drying; cleans up with soap and water; adheres well without sanding; blocks oily stains.

CONS Water will rough up raw wood and MDF, and cause cedar and redwood to bleed.

ONE TO LOOK FORKILZ Premium Interior/Exterior Multi-purpose Water-based Wall and Ceiling Primer, $23 per gallon; Lowe’s

BEST FOR Coating raw wood, MDF, spackled spots, and rust-prone steel or wrought iron.

PROS Penetrates wood without raising grain. Blocks water and mildew stains, cedar and redwood bleed.

CONS Requires good ventilation during application and mineral spirits for cleanup.

ONE TO LOOK FORXIM 11301 1G X-Seal Alkyd Primer/Sealer/Stain Blocker, $30 per gallon; World Paint Supply

BEST FOR Spot priming exterior rust stains and knots. Sealing smoke damage and odors. Prepping glossy, greasy surfaces without sanding.

PROS Works on all surfaces and blocks all stains and smells; some DIYers rely on it to seal cut edges on MDF.

CONS Pricey. Strong odor when wet. Cleanup calls for denatured alcohol.

ONE TO LOOK FORZinsser B-I-N Shellac-Based White Interior/Spot Exterior Primer and Sealer, $45 per gallon; Home Depot