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I always recommend applying 3 thin coats of such sealer primers. You have to remember that paint only cover a certain percentage (which is why we most often need to apply 2 coats in order to get a good coverage). But when using a sealer primer to hide a stain I always take the safer route and apply that 1 extra coat to avoid having to start all over again.

If you are using a quality stain block primer, not Kilz, you should be able to block a stain in a single coat. Realize that many are designed to not visually completely cover, but to stop the oils, waxes, resins and undissolved solids from leaching through the top coat of paint, so you may still be able to see the shadow of the stain through the primer without needing to apply a second coat of primer.

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12y ago
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Q: How many coats when using Kilz primer on the walls?
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