Ugh, pine sap seeping through trim paint

jsheridan

Shellac bonds to everything, it's the premier bonding primer

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chrisn

Except, maybe, silicon caulk

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Brushjockey

Oh there ya go-- always an exception!

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"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS

chrisn

but right? yes?

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jsheridan

BJ's going to the dark side

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Will22

It's tannin acid.

Pine does not contain tannins, like redwood and cedar do. It bleeds sap from knots in the wood. As stated previously, a shellac base coat will block this out before painting.

jsheridan

Sorry Will, that's just not true. How would sap from knots discolor the whole side frame of OP's window?
All pine contains tannin. White pine contains less tannin than yellow pine. I've always known pine to be a bleed problem from tannin, and a quick google search of pine and tannin only proved it. They actually make products specifically from the tannin of pine.

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