Discolouration on a new paint layer?

There may be times when a yellow or pink stain will bleed through the paint, particularly when using a lighter colour. This is known as “bleed through.” There are a couple of reasons this happens: The piece of furniture was previously stained with a bleeding stain (typically found on pieces from the 1930s and 1940s), or you are painting over an open grain wood where its tannins are stored in the wood grain (oak is notorious for this). To remedy this apply one or two coats of clear shellac or clear knotting solution (Rustin and International are two good brands) by cloth of brush to block the staining effect. If you have already applied a coat of Chalk Paint, there is no need to remove the layer of paint; just apply the shellac directly on top.

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