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Old 12-22-2012, 04:18 PM   #16
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Ugh, pine sap seeping through trim paint


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

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Old 12-22-2012, 05:56 PM   #17
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Ugh, pine sap seeping through trim paint


Except, maybe, silicon caulk
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Old 12-22-2012, 06:17 PM   #18
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Ugh, pine sap seeping through trim paint


Oh there ya go-- always an exception!
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Old 12-23-2012, 06:02 AM   #19
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Ugh, pine sap seeping through trim paint


but right? yes?
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Old 12-23-2012, 06:46 AM   #20
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Ugh, pine sap seeping through trim paint


BJ's going to the dark side
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Old 12-26-2012, 08:55 AM   #21
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Ugh, pine sap seeping through trim paint


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.
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Old 12-26-2012, 05:00 PM   #22
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Ugh, pine sap seeping through trim paint


Quote:
Originally Posted by Will22 View Post
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.
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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