What is paint primer?

Sherwin-Williams says "Primer is specially formulated to make sure the top coat of paint adheres to the surface below, creating the best-looking, longest-lasting finish." (read 2026-11-03).

InstaBids is an AI-run marketplace for homeowners and property managers: describe a home job once, by chat or through your own AI assistant, add photos, and get multiple written quotes on the same scope, compared apples to apples, with no phone calls or home visits before you pick.

By InstaBids editorial team with AI research agents. Updated 3 November 2026

What this means for your home project

Benjamin Moore says "Before you select a primer for your project, you should first determine whether you even need to prime." (read 2026-11-03). Source: Benjamin Moore, read 2026-11-03.
Benjamin Moore says "To apply acrylic primer, begin by stirring thoroughly." (read 2026-11-03). Source: Benjamin Moore, read 2026-11-03.
Sherwin-Williams says "Naturally it would be good to test this system first on a small section prior to tackling the whole project." (read 2026-11-03). Source: Sherwin-Williams, read 2026-11-03.

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MCP connector URLhttps://instabids.ai/api/agent/mcp
Agent API (OpenAPI)https://instabids.ai/openapi.json
Start-request linkhttps://instabids.ai/intake?from=glossary-paint-primer&page_type=glossary&job=Prepare+and+prime+surfaces+for+painting&utm_source=us&utm_medium=page&utm_campaign=glossary
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Do I need to prime a wall prior to painting it?

Benjamin Moore says (read 2026-11-03): “Most previously painted, undamaged and untainted walls do not require priming, especially when using a high-quality interior paint.” Source: Benjamin Moore, read 2026-11-03.

How should I choose a primer?

Benjamin Moore says (read 2026-11-03): “When selecting a primer, choose between acrylic (water-based) or alkyd (oil-based) options.” Source: Benjamin Moore, read 2026-11-03.

How do you apply primer paint?

Sherwin-Williams says (read 2026-11-03): “Prime the remainder of your wall with a roller.” Source: Sherwin-Williams, read 2026-11-03. “Use a ⅜" to ½" nap thickness for smooth surfaces.” Source: Sherwin-Williams, read 2026-11-03.

Why do I need to use a primer instead of just using two coats of the finish paint?

Sherwin-Williams says (read 2026-11-03): “A primer is beneficial because it helps provide a uniform surface that promotes good adhesion of the topcoat.” Source: Sherwin-Williams, read 2026-11-03.

For interior doors and trim with glossy finishes, can I use a primer instead of sanding or scuffing the surface?

Sherwin-Williams says (read 2026-11-03): “You want to use Adhesion Primer.” Source: Sherwin-Williams, read 2026-11-03. “You will still need to wash and clean the surface first.” Source: Sherwin-Williams, read 2026-11-03.

Sources

A Good Paint Job Starts With a Good Foundation — Sherwin-Williams; read 2026-11-03.
FAQ: priming an existing wall — Benjamin Moore; read 2026-11-03.
Primers: frequently asked questions — Benjamin Moore; read 2026-11-03.
Exterior Surface Preparation Frequently Asked Questions — Sherwin-Williams; read 2026-11-03.
Interior Surface Preparation: glossy doors and trim — Sherwin-Williams; read 2026-11-03.
How to Choose the Best Paint Primer — Benjamin Moore; read 2026-11-03.
Paint Application FAQ: stained and clear-coated cabinets — Sherwin-Williams; read 2026-11-03.
How to Prep Walls: priming — Sherwin-Williams; read 2026-11-03.