Pre-treat for changes in humidity? - Woodworking Talk - Woodworkers Forum
 
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post #1 of 8 Old 10-12-2013, 12:30 PM Thread Starter
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Pre-treat for changes in humidity?

Is it possible to treat lumber and or plywood, so that they don't expand (or shrink, if that's possible?) due to humidity after being assembled?


I want to paint a cabinet with automotive paint and clear. I read that it's not very tolerant of this, and it will crack.

Thanks.
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post #2 of 8 Old 10-12-2013, 02:11 PM
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Plywood is more stable than solid wood, due to how it is made . So it won't be expanding and contracting on you.
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post #3 of 8 Old 10-12-2013, 02:30 PM Thread Starter
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Quote:
Originally Posted by rayking49 View Post
Plywood is more stable than solid wood, due to how it is made . So it won't be expanding and contracting on you.

Thanks for that! Is there a treatment for lumber?

Also, how about MDF?

Last edited by icor1031; 10-12-2013 at 03:07 PM.
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post #4 of 8 Old 10-12-2013, 03:32 PM
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MDF will be the most stable. Spend some needed time sealing any edges. It'll suck up more finish than you can afford.
Keep in mind that MDF is heavy, so think over how you secure the cab to whatever surface it will be applied.
Bill

Last edited by Bill White; 10-12-2013 at 03:34 PM.
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post #5 of 8 Old 10-12-2013, 08:11 PM
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The only treatment for wood is time. It may take a hundred years for solid wood to stop shrinking. A lot of automotive paints won't tolerate wood movement. I think if you use a 2k urethane it would be elastic enough to work. If you could use MDF like Bill White suggested that would help.
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post #6 of 8 Old 10-12-2013, 08:27 PM
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Why do you want to use an automotive finish? Automotive finishes are formulated to work best on non-porous surfaces. In addition, most auto finishes have been reformulated in recent years to deal with VOC issues. They are also intended to be force dried and cured in most cases.

Howie..........
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post #7 of 8 Old 10-12-2013, 09:04 PM
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You can stabilize wood using vacuum impregnation with epoxy or better acrylic resin (google "TexTurn Cactus juice"). But I have seen that only for pen turning blanks. It would be complicated and quite expensive for a full sized board.

That said, I am looking into doing exactly that to make precise mechanical parts (that must not move with humidity) out of solid wood. Not sure if it really can be done.
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post #8 of 8 Old 10-12-2013, 09:06 PM
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Wood moves with humidity changes. It is what it is and pretty much nothing you do will stop it. Nature of the beast. Use a paint designed for wood.

Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Finishing is 3 parts chemistry and 1 part VooDoo http://lrgwood.com
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