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Tannin bleed

M

Mikes

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Joined
May 9, 2025
Messages
7
I've redone trim in multiple projects inside and out since 2016, always using pine boards and quality primers like BIN shellac. But still, every single job ends up with tannin bleed, even under oil or water-based topcoats. My PS34 doesn't give me this much trouble, what am I missing before I tackle the second floor?
 
Pine is crazy for tannin bleed, even with good primers. BIN shellac usually works, tho for stubborn bleed through, better make sure the wood is dry fully, sanded well, and apply multiple thin coats of primer. You should also try switching to a hardwood or pre-primed trim to avoid the hassle
 
JAZEN said:
Pine is crazy for tannin bleed, even with good primers. BIN shellac usually works, tho for stubborn bleed through, better make sure the wood is dry fully, sanded well, and apply multiple thin coats of primer. You should also try switching to a hardwood or pre-primed trim to avoid the hassle
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Yeah I'll focus on ensuring the pine is fully dry and well sanded, plus apply several thin primer coats, switching to hardwood or pre-primed trim sounds worth considering too.
 
Mikes said:
Yeah I'll focus on ensuring the pine is fully dry and well sanded, plus apply several thin primer coats, switching to hardwood or pre-primed trim sounds worth considering too.
Click to expand...
It'll save you some time and effort.. Good luck!
 
Interesting to find this post!
A guy I know got into a similar situation and he said what actually worked was applying a third coat of BIN on the worst knotty areas.
He swore by it for really sappy wood, almost like building up a shellac barrier!
Anyway, are you now working on the second floor?
 

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