Priming isn’t just for new drywall—it can be essential for repainting, too. Whether you’re refreshing a room or changing the color completely, primer plays a crucial role in achieving smooth, even coverage. Below, the experts at Randall’s answer common questions about when and why to use primer on already painted walls.
1. Do I need primer if the wall has already been painted?
It depends on the wall’s condition and the paint you’re using. You’ll need primer if:
- The previous paint is glossy or oil-based
- You’re switching from a dark color to a light one
- The surface has stains, patches, or peeling paint
- You’re painting over new drywall repairs
If the existing paint is clean, matte, and in good condition, you may be able to skip priming.
2. What does primer actually do?
Primer helps create a uniform, adhesive surface for paint to stick to. It improves coverage, hides imperfections, and enhances the longevity of the paint finish.
Randall’s offers high-quality primers in its collectionsdesigned for every surface—from drywall to glossy finishes.
3. When should I definitely use primer on old paint?
Use primer when:
- The old paint is chipping or flaking
- You’re changing the paint type (from oil-based to latex, for example)
- You notice stains, smoke marks, or water damage
- You’re covering strong odors or bright colors
Primer ensures consistent color and helps prevent old stains from seeping through.
4. Can I just use paint with built-in primer instead?
“Paint and primer in one” products can work for light touch-ups or walls in good condition. However, for major color changes, stains, or problem areas, using a dedicated primer first is more effective.
5. What happens if I skip primer when it’s needed?
You might see:
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Uneven color coverage
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Peeling or flaking paint
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Visible stains or streaks
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Reduced paint adhesion and shorter lifespan
Skipping primer can cost more time and money in the long run.
6. Which primer should I use on previously painted walls?
Choose based on your wall type and paint:
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Latex primer for walls previously painted with water-based paint.
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Oil-based primer for glossy or oil-painted surfaces.
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Stain-blocking primer for smoke, water, or mildew stains.
Randall’s team can help you select the right primer through its expert services
7. How do I prepare previously painted walls before applying primer?
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Clean the walls with a mild soap solution.
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Repair cracks and holes with spackling compound.
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Sand glossy or uneven areas for better adhesion.
- Wipe off dust before applying primer evenly.
Need supplies? Browse brushes, rollers, and prep tools at Randall’s collections
8. Can I use primer to cover stains or marks on old walls?
Yes. Stain-blocking primers seal discoloration caused by smoke, water, or mildew. They prevent bleed-through and keep your final paint looking fresh.
9. How many coats of primer do I need?
One coat is usually enough, but if the previous color is very dark or the surface heavily stained, apply two coats for optimal coverage.
10. Should I hire a professional for priming and repainting?
If your walls have peeling paint, heavy stains, or multiple layers of old paint, hiring a pro ensures a flawless result. You can connect with trusted painters using Randall’s Painter Order Form
11. How can Randall’s help with my painting project?
- Randall’s provides:
- Premium primers and paints for all surfaces
- Personalized guidance from paint experts
- Professional servicesfor residential and commercial projects
- Friendly support via our Contact Us
Primer is your paint’s foundation—it ensures smoother coverage, stronger adhesion, and longer-lasting results. Even on previously painted walls, taking the extra step to prime can make your paint job look professionally done.
At Randall’s, we’re here to help you choose the best primers and paints for every surface in your home.