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Subject: Re: Douglas Fir Pitch/Sap

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Message Thread:

Douglas Fir Pitch/Sap

7/2/22       
gary

Not sure how many of you out there use V/G Douglas Fir but sometimes it has the bad habit of exuding a little bit of pitch/sap here and there. For interior work a coat of shellac will nip that in the bud. BUT for exterior work I am looking for something to do the same ? ( shellac isn't rated for exterior). I am thinking that perhaps a coating of West Systems epoxy ? Your thoughts would be appreciated.

7/2/22       #2: Douglas Fir Pitch/Sap ...
Mark B Member

Your likely gonna get sqwak that your DF wasnt dried/pitch-set properly and blah blah blah. You'll have to do whatever is needed to lock up the bleed. Epoxy is a good choice but hard to know youve found all of the trouble spots.

7/2/22       #3: Douglas Fir Pitch/Sap ...
nicko

I am pretty sure you can use BIN for spot priming on the exterior. I haven't read the can for a while but I am pretty sure it says that on the can.

Nicko

7/3/22       #4: Douglas Fir Pitch/Sap ...
Mark B Member

Not saying I can quote the can but you can never spot prime with BIN as it will always show through no matter how many top coats but i have no idea how that pertains to things like heavy oil based exterior top coats.
I know many many years ago we porked ourselves spot priming a greasy commerial kitchen ceiling and there was no amount of coats that would burry it (dont ask) til we primed the entire thing with BIN (smarter to begin with) and final coated.
7/5/22       #5: Douglas Fir Pitch/Sap ...
Bruce H

If the Douglas Fir sap wasn't properly set in the KD process, at some point it will come out no matter what you put on the outside.

7/5/22       #6: Douglas Fir Pitch/Sap ...
nicko

I cant recall ever having BIN flash but I have had Kilz flash. And yes it would flash no matter how many coats of paint i put on it. I just spot primed a textured ceiling that had a small spot of water damage bleed through and it did not flash after i painted it. And the Bin instructions say for exterior spot priming.

7/6/22       #7: Douglas Fir Pitch/Sap ...
BH Davis  Member

Website: http://www.bhdavis.net

Bin is just white tinted shellac. You can do the same spot priming outdoors with Bin or shellac.

Shellac does not expand and contract with wood movement and will pop if done over large wood surfaces. That is why it is only good for spot priming in exterior applications.

BH Davis

7/7/22       #8: Douglas Fir Pitch/Sap ...
Matt Calnen

If your application is stain or clear finish, I have had pretty good luck taking a heat gun and heating up the pocket and getting as much of the pitch out as you can. Then tape off and fill it with a good five minute epoxy.

7/8/22       #9: Douglas Fir Pitch/Sap ...
Joe Calhoon Member

God idea on the heat gun Matt. I will try that next time I encounter this with VG. I have had fair luck with epoxy on small pockets. Big ones not so much. It’s best to just cut them out but sometimes they don’t show up till profiling and milling. If it is paint grade a plug cutter works well to get rid of the pocket. That pitch in VG will break through any film finish.

 

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