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When do I know to use a primer for my project and how do I pick what to use?
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Unfinished surfaces:
- For raw woods, you need to seal the wood so that it doesn’t soak up your paints and cause your coat to look uneven. (As a bonus, it will also cover dark spots and knots in the wood and not allow them to show through your paint.) An oil-based primer works well on sealing interior woods and also provides a smooth surface that allows your paint to adhere.
- For unfinished drywall, use a PVA primer to cover joint compound and provide a smooth surface for your paint.
Stained surfaces:
- Oil-based primers work best on water-based stains, such as inks, foods and smoke.
- Water-based primers work best on oil-based stains, such as grease, lipstick and crayons.
- Shellac-based primers work best for stains that come from severe smoke or water damage. They also keep stains from producing odors.
Previously painted surfaces:
- If you’re painting lighter color over a dark color, use a quality primer to cover the darker hue and provide a nice, light surface for your topcoat. Two or more coats of primer may be necessary depending on the color you’re covering.
- If you’re painting a darker shade over a lighter shade, use a tintable primer. This provides a good surface for your topcoat, while also preventing the old color from bleeding through.
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