Yes, new drywall should be primed before painting. Drywall paper and the joint compound used over seams and fasteners are porous and can absorb paint differently. Primer helps seal the surface and create a more uniform base for your finish coats.
The same applies to Sheetrock. Sheetrock is simply a brand of drywall, so if you’re painting new Sheetrock, it should be properly primed before painting as well.
Why Do You Need to Prime New Drywall?
New drywall isn’t a uniform surface. The drywall face paper and areas covered with joint compound have different levels of porosity, which means they can absorb paint differently.
Applying a drywall primer helps seal these surfaces and even out their absorption. This can improve the appearance of the finished paint and help prevent areas of joint compound from appearing noticeably different from the surrounding drywall.
How to Prime Drywall Before Painting
1. Make Sure the Drywall Is Ready
All joint compound should be completely dry, and seams, fasteners, and repairs should be properly finished before you begin priming.
2. Sand the Surface
Sand the finished joint compound as needed to create a smooth surface. Be careful not to damage the drywall paper while sanding.
3. Remove the Dust
Drywall sanding can leave a significant amount of dust behind. Remove loose dust from the walls and surrounding area before applying primer.
4. Apply Drywall Primer
Apply a primer intended for new drywall according to the manufacturer’s instructions. Work systematically to create an even coat across the drywall and finished joint compound.
5. Inspect the Surface
Once the primer has dried, inspect the wall for imperfections that are easier to see now that the surface has a uniform coating. Make any necessary repairs and spot-prime those areas before painting.
What Happens if You Don’t Prime Drywall Before Painting?
Painting directly over new drywall can result in uneven paint absorption and an inconsistent-looking finish. Areas covered with joint compound may look different from the drywall paper even after they’ve been painted.
You may also use more finish paint trying to achieve uniform coverage that could have been established more effectively with the proper primer.
What Kind of Primer Should You Use on New Drywall?
Use a primer specifically designed for new drywall or another primer approved by the manufacturer for that application. These products are formulated to seal the porous drywall paper and joint compound and provide a suitable surface for paint.
The best primer can also depend on the paint you’re applying and the conditions of the project.
How Many Coats of Primer Do You Need on Drywall?
One properly applied coat of the appropriate drywall primer is sufficient for many new drywall projects.
Additional priming may be necessary if you’re addressing repairs, problem areas, or another condition that requires it. Follow the instructions for the specific primer you’re using.
Do You Need to Prime Previously Painted Drywall?
Not necessarily. If the drywall is already painted and the existing coating is clean, firmly adhered, and in good condition, you can often repaint it without priming the entire wall.
Primer may still be needed over repairs, stains, exposed drywall, or other problem areas before repainting. For more info, read our post about priming before painting.
Do Drywall Repairs Need to Be Primed?
Yes, areas repaired with joint compound or similar materials should generally be primed before painting. The repair can absorb paint differently from the surrounding painted wall, potentially leaving a noticeable difference in the finish.
Spot-priming the repaired area helps seal it and create a more uniform surface before you repaint.
Visit Our Stores for the Best Primer and Paint for Drywall
Stop by Loconsolo Paints before starting your project. Our knowledgeable team can help you choose the right Benjamin Moore primer and paint for new drywall, Sheetrock, repairs, or previously painted walls.
Visit one of our NYC paint shop locations for primer, paint, and the supplies you need to get the job done.