I build DIY furniture, I am often painting wood. Sometimes it’s new raw wood, and sometimes I’m covering up an old finish. White and light colored paint are particularly tricky because they are susceptible to tannin bleed through staining.
What are tannins? Tannins are natural occurring compounds found in many plants (including coffee, tea and grapes/wine). Wood contains tannin as well and it tends to seep to the surface, even after the wood is completely dried. Red colored wood is the worst culplrit, although it doesn’t have to be naturally pigmented to cause problems as well.
More than once, I’ve gone through the recommended steps (sanding, priming, two coats of paint, 2-3 coats of clear) to paint a…
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