Primer is one of the most important steps in preparing interior walls, yet it is often overlooked. Whether you are repainting, repairing damage, or applying a bold new color, using the right primer can make a noticeable difference in how your paint performs. This FAQ explains what primers do, when to use them, and how to choose the right formula for your project.
Why is primer needed on interior walls
Primer creates a uniform base that helps paint adhere properly and look consistent. It seals porous surfaces, hides previous colors, and prevents stains or marks from bleeding through. Without primer, even high quality paint may appear uneven or require more coats.
What types of surfaces benefit most from primer
Primer is especially helpful on:
- New drywall
- Patched or repaired areas
- Stained surfaces
- Glossy or previously enamel coated walls
- Surfaces that absorb paint unevenly
- Walls transitioning from dark to light colors
Each of these situations needs a sealed, even surface for the best finish.
Are there different types of interior primers
Yes. Common categories include:
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Latex primer:
Ideal for everyday surfaces. Easy to use and low odor.
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Stain blocking primer:
Best for smoke marks, water stains, crayon, grease, or heavy discoloration.
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Bonding primer:
Designed to grip slick or glossy surfaces so new paint adheres properly.
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High build primer:
Helps smooth out minor surface imperfections and create a more even texture.
Each formula supports a different challenge, so choosing correctly matters.
Do I need primer if I am using a paint and primer in one
Paint and primer in one products can save time, but they do not replace true primer in every situation. They work well on previously painted walls in good condition, but they may not seal stains, block dark colors, or grip glossy surfaces as effectively as a dedicated primer.
How many coats of primer do I need
Most projects only need one coat. Situations like strong stains or dramatic color changes may require two. Allow each coat to dry fully before painting.
Does primer help when switching from dark to light colors
Absolutely. Primer dramatically improves coverage when making high contrast color changes. A tinted primer is often recommended because it creates a transitional base between the old and new colors.
Should I sand before or after priming
Light sanding before priming helps the primer bond more effectively. Sanding after priming can smooth minor imperfections and create an ideal surface for the topcoat.
Are low VOC primers available
Yes. Many interior primers now come in low VOC formulas that reduce odor and chemical emissions, making them a healthier choice for indoor spaces. These options still perform well on a wide range of surfaces.
How long should primer dry before I paint
Most primers dry within one to two hours, although stain blocking and high build formulas may require a bit longer. Always check the product label for accurate timing.
When should I ask a professional for help
If you are dealing with heavy stains, unusual wall textures, difficult surfaces, or major repairs, a professional can help select the right system for long lasting results.
- Explore expert support on the Services page: services page
- Contractors can place orders using the Painter Order Form: painter order form
- Browse primers, tools, and paints in the Collections section: paint collection
- For questions, visit the Contact Us page: Contact Us
A good primer lays the foundation for great paint results. It strengthens adhesion, improves coverage, and helps create a smooth, even surface that stands up to everyday wear. Whether you are working on a small touch up or a full interior refresh, choosing the right primer will make the final finish look cleaner and last longer. If you need help selecting products or preparing your walls, the team at Randall’s is ready to guide you every step of the way.