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-   -   Ugh, pine sap seeping through trim paint (http://www.diychatroom.com/f4/ugh-pine-sap-seeping-through-trim-paint-167074/)

nuclearnerd 12-21-2012 01:29 PM

Ugh, pine sap seeping through trim paint
 
1 Attachment(s)
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.

jsheridan 12-21-2012 02:40 PM

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.

joecaption 12-21-2012 04:43 PM

If you used Kilnz primer, there's the problum.

jsheridan 12-21-2012 06:00 PM

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.

Gymschu 12-21-2012 08:50 PM

Kilz is actually pretty good at holding out tannin bleed from pine. Maybe not a first choice, but certainly adequate.

chrisn 12-22-2012 05:17 AM

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

chrisn 12-22-2012 05:19 AM

Quote:

Originally Posted by Gymschu (Post 1077745)
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

Brushjockey 12-22-2012 06:44 AM

..spell check doesn't know brand names chris...

chrisn 12-22-2012 07:29 AM

Quote:

Originally Posted by Brushjockey (Post 1077859)
..spell check doesn't know brand names chris...


it knows problem:yes:

Brushjockey 12-22-2012 07:46 AM

Here- Kilz spelled correctly still looks like a problem...

jsheridan 12-22-2012 08:00 AM

It would know "problum" and "exohost" fan though, just sayin.

Brushjockey 12-22-2012 08:20 AM

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

chrisn 12-22-2012 10:37 AM

Quote:

Originally Posted by Brushjockey (Post 1077892)
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

nuclearnerd 12-22-2012 01:36 PM

Thanks for the Shellac advice. Can I apply it over the existing latex, or do I have to strip back down to bare wood?

Brushjockey 12-22-2012 03:01 PM

Over should be no problem


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