Sanding vs. Priming: What’s the Difference and When Do You Need Each?
If you're planning a painting project, you've probably heard the terms sanding and priming tossed around. While both are essential prep steps, they serve very different purposes—and knowing when to use each can make or break your paint job.
At Washington Paint Works, we take prep seriously because it’s the foundation of a flawless, long-lasting finish. Here’s a breakdown of sanding vs. priming, and why each matters.
What Is Sanding?
Sanding involves smoothing a surface using abrasive materials like sandpaper or sanding blocks. It’s used to:
Remove old paint, gloss, or imperfections
Smooth out patched areas or rough textures
Create a surface that paint or primer can adhere to
When Sanding Is Needed:
Before painting glossy surfaces (like trim or cabinets)
After patching holes or cracks
When repainting over uneven or peeling paint
On raw wood to open the grain for better absorption
Sanding ensures your surface is smooth, clean, and ready to bond with the next layer—whether it’s primer or paint.
What Is Priming?
Priming is the process of applying a base coat that prepares the surface for paint. It helps:
Seal porous surfaces (like drywall or bare wood)
Improve paint adhesion
Enhance color uniformity
Block stains, odors, or previous colors
When Priming Is Needed:
On new drywall or bare wood
When switching from dark to light colors
Over patched or repaired areas
On surfaces prone to stains or moisture
Priming creates a stable, sealed surface that allows paint to perform at its best—especially in high-traffic or moisture-prone areas.
Do You Ever Need Both?
Absolutely. In fact, most professional paint jobs require both sanding and priming:
Sand first to smooth and clean the surface.
Prime next to seal and prepare it for paint.
Skipping either step can lead to poor adhesion, uneven coverage, and premature wear.
Why Prep Matters
At Washington Paint Works, we never cut corners. We assess every surface to determine the right prep strategy—because great painting isn’t just about color, it’s about craftsmanship.
👉 Schedule your FREE estimate today and let us show you how proper prep leads to stunning results that last.