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Old 12-21-2012, 01:29 PM   #1
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Ugh, pine sap seeping through trim paint


I redid my attic window trim with select pine, which I primed and painted with three coats of (pure) white latex. It's been about six months, and some of the boards are starting to yellow! I'm guessing it's sap from the wood making its way through the paint. Does anyone have any suggestions on how to stop the process, and return my trim to a clean white?

The windows on this old house are no longer square to the wall, so I had to do a lot of fancy carpentry to fit the trim. I'd really like to avoid suggestions that involve me redoing it (though next time I'm using MDF!)

Thanks in advance.
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Old 12-21-2012, 02:40 PM   #2
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Ugh, pine sap seeping through trim paint


It's tannin acid. The only solution is to coat the affected areas with Zinsser BIN. It's an alcohol based pigmented shellac. You can get quarts of it at HD. Use a nylon bristle brush and do clean up with ammonia. It dries quickly, very quickly, so you'll have figure out how to work with it without making a mess. Good luck and check back with any questions.

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Old 12-21-2012, 04:43 PM   #3
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Ugh, pine sap seeping through trim paint


If you used Kilnz primer, there's the problum.
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Old 12-21-2012, 06:00 PM   #4
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Ugh, pine sap seeping through trim paint


Kilnz are where they fire pottery. And actually, if he used oil Kilz, he would have bought himself some more time. Oil will hold back tannin longer than latex but not as long as shellac.
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Old 12-21-2012, 08:50 PM   #5
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Ugh, pine sap seeping through trim paint


Kilz is actually pretty good at holding out tannin bleed from pine. Maybe not a first choice, but certainly adequate.
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Old 12-22-2012, 05:17 AM   #6
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Ugh, pine sap seeping through trim paint


[quote=joecaption;1077619]If you used Kilnz primer, there's the problum.[/quote]



WRONG again as usual. Joe, please, please ,please, please, please,please ,a thousand times, please

1) Hit the spell check icon( the ABC thing in the upper right hand corner)

2) Stop posting on painting topics of which you have no knowledge
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Old 12-22-2012, 05:19 AM   #7
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Ugh, pine sap seeping through trim paint


Quote:
Originally Posted by Gymschu View Post
Kilz is actually pretty good at holding out tannin bleed from pine. Maybe not a first choice, but certainly adequate.
I have seen it bleed though many times,

BIN, never
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Old 12-22-2012, 06:44 AM   #8
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Ugh, pine sap seeping through trim paint


..spell check doesn't know brand names chris...
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Old 12-22-2012, 07:29 AM   #9
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Quote:
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..spell check doesn't know brand names chris...

it knows problem
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Old 12-22-2012, 07:46 AM   #10
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Ugh, pine sap seeping through trim paint


Here- Kilz spelled correctly still looks like a problem...
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Old 12-22-2012, 08:00 AM   #11
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Ugh, pine sap seeping through trim paint


It would know "problum" and "exohost" fan though, just sayin.
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Old 12-22-2012, 08:20 AM   #12
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Hey- I'm not backing JC's speeling! ( Or mine sometimes..)
But chris has learned to use fancy letters- lol
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Old 12-22-2012, 10:37 AM   #13
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Ugh, pine sap seeping through trim paint


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Hey- I'm not backing JC's speeling! ( Or mine sometimes..)
But chris has learned to use fancy letters- lol

I'm lost ...............................................aga in
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Old 12-22-2012, 01:36 PM   #14
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Ugh, pine sap seeping through trim paint


Thanks for the Shellac advice. Can I apply it over the existing latex, or do I have to strip back down to bare wood?
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Old 12-22-2012, 03:01 PM   #15
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Over should be no problem

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