problems with leaking tree sap - Woodworking Talk - Woodworkers Forum
 
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post #1 of 6 Old 07-19-2011, 01:14 PM Thread Starter
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problems with leaking tree sap

I'm building some planter boxes out of cheap redwood fencing material but several of the boards have significant amounts of sap leaking out. It get on everything-mostly me.

Any way to deal with this other than constantly washing with solvent?
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post #2 of 6 Old 07-19-2011, 01:31 PM
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Wash it down really well with a solvent and hit it with a 2lb cut of shellac. Shellac will seal just about anything, pine knots included. So it will likely work well on that too.

You could just grab a quart Zinnser seal-coat, or even their waxed shellac. Just slop it on full strength and it should work.
Just be sure to clean it good and apply the shellac as soon as the solvent dries.

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post #3 of 6 Old 07-19-2011, 10:48 PM
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shellac is no9t going to stop sap from ooooozing out. i would set your boards in the sun till they stop oooooozing, its not really going to hurt anything as a planter.
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post #4 of 6 Old 07-19-2011, 11:24 PM
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Sounds like your lumber was not kiln dried.

I believe it takes something like 160*F to set the pitch.

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post #5 of 6 Old 07-22-2011, 02:09 PM
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Quote:
Originally Posted by jack warner View Post
shellac is no9t going to stop sap from ooooozing out. i would set your boards in the sun till they stop oooooozing, its not really going to hurt anything as a planter.
Sorry, but I have to disagree with that. I have used shellac many times to do exactly that, and I can't ever remember it not working.

I use a lot of pine as a secondary wood, and I have encountered my fair share of sap pockets oozing and oozing knots. The best solution I have found thus far (on the recommendation of Charles Neil) is to wipe it with a solvent and apply a good coat of shellac. In most every case I have done this, it has stopped the oozing.

I have a pair of Adirondacks on my sun porch that had several oozing knots, and after finishing them with a 3ln cut of amber shellac, I have yet to have any more sap ooze from them.

Wayne
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post #6 of 6 Old 07-22-2011, 07:59 PM
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Don't know where you're located, but If 160 degrees will set the pitch, just set them in the sun here in Atlanta and it'll get set. It's so hot down here right now that farmers are feeding their chickens crushed ice to keep them from laying boiled eggs.
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