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Outdoor pine sap/extractive bleeding

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Forum topic by Broooklyn posted 08-09-2020 11:31 PM 255 views 0 times favorited 9 replies Add to Favorites Watch
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Broooklyn

54 posts in 3895 days


08-09-2020 11:31 PM

Finished some outdoor chairs a week ago (out of “select pine board”). I put 2 coats of gray exterior paint on them. They are in a pretty sunny spot and sap is coming out of the end grain and brown/yellow streaks are showing through the faces. Can anything be done?

-- Matt - Brooklyn, NY


9 replies so far

View Aj2's profile

Aj2

3323 posts in 2645 days


#1 posted 08-10-2020 12:21 AM

It should stop weeping sap in about 40 years. :)
You just found out why conifers like pine and Douglas fir should be kiln dried to set the pitch.
The wood thinks it’s still alive and is trying to protect itself from the heat that why the sap flows.
Kiln does exactly what it sounds like kills it.
Good Luck that a neat looking space you have there.

-- Aj

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ibewjon

1934 posts in 3641 days


#2 posted 08-10-2020 01:10 AM

Try a layer or 2 of Kilz white pigmented shellac. It claims to seal knots and sap. Be sure it is the alcohol thinned shellac type. There are other s that are not shellac.

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Broooklyn

54 posts in 3895 days


#3 posted 08-10-2020 01:11 AM

Thanks Aj – Well, I can handle it on the end grain but it’s sort of a buzz kill to have sap on the parts where you sit!

-- Matt - Brooklyn, NY

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Broooklyn

54 posts in 3895 days


#4 posted 08-10-2020 01:16 AM



Try a layer or 2 of Kilz white pigmented shellac. It claims to seal knots and sap. Be sure it is the alcohol thinned shellac type. There are other s that are not shellac.

- ibewjon

I’m guessing I’d need to replace the wood or sand off the existing paint?

-- Matt - Brooklyn, NY

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Aj2

3323 posts in 2645 days


#5 posted 08-10-2020 01:23 AM

My experience is nothing will stop it. Except winter

-- Aj

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ibewjon

1934 posts in 3641 days


#6 posted 08-10-2020 01:55 AM

Scrape off the thickest part, lightly sand the paint around it, and paint it. Nothing to lose. You can also call Rust Oleum customer service, maker of Zinsser, and ask about it. This is a good reason to use white cedar or cypress. Next time. You will need to put outdoor paint over the shellac.

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ibewjon

1934 posts in 3641 days


#7 posted 08-10-2020 01:55 AM

Scrape off the thickest part, lightly sand the paint around it, and paint it. Nothing to lose. You can also call Rust Oleum customer service, maker of Zinsser, and ask about it. This is a good reason to use white cedar or cypress. Next time.

View Planeman40's profile

Planeman40

1516 posts in 3608 days


#8 posted 08-10-2020 08:37 AM

Ditto on the Kilz white pigmented shellac. Should work. I have used it. The Kilz should seal it but won’t stand up to outdoor use. Paint over with some outdoor rated varnish or paint.

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

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Axis39

336 posts in 445 days


#9 posted 08-10-2020 01:21 PM

You might try Pinesol to get the sap off before scraping. I’ve also found the orange oil hand sanitizer my wife bought has been fabulous at removing sap from my hands.

Scraping will get rid of the sap, but if it’s still too gooey, it can get messy quick. I hate the idea of scraping and knowing I’ll be goofing up the finish that I’ll have to fix later… So, the idea of using a product I can wipe on and off with a rag, hopefully minimizing the damage to the finish, just appeals a little more to me.

The Zinser BIN primer can go right over other paint…

-- John F. SoCal transplant, chewer uppper of good wood

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