Kreg Owners' Community

Howdy All,

I have a question about what type of movement should be expected from wood once it's been sealed by, let's say, three coats of poly-urethane?

A simple example would be a bench made out of pine that's completely covered in primer, painted (for color), and then sealed with urethane. What type of movement can one expect from this piece of furniture as the years progress? I'm under the impression that sealing wood not only keeps moisture out, but also keeps it in too.

All replies from the community are appreciated. Thanks all.

-- Troy

Views: 1488

Reply to This

Replies to This Discussion

Finished projects will continue to absorb or give off moisture with changes in humidity and temperature of the surrounding air.  The wood will always undergo changes in moisture content and dimension.

Wood does not move in all directions equally.  The greatest movement is across the grain. 

It is not possible to accurately predict the movement of a single piece of wood. 

Failure to account for movement may eventually lead to cracking (shrinkage) or excessive cupping (expansion), such as in the table top.

Applying a finish. 

Apply an equal number of coats to ALL surfaces to equalize the loss or gain of moisture.  No finish will block moisture transfer; they just slow it down.  Penetrating oils provide the least protection.  Epoxy offers the greatest.

The tendency of wood to contract and expand, shrink and swell cannot be stopped. You must plan for it.  Design and build with dimensional change in mind.

Wow! That's a pretty thorough explanation right there. Thanks Ken. I'll take what you've taught me, and use it wisely. :)

Hi Troy,

Thanks for your reply.

Glad you found it useful.


First moisture check your wood prior to finishing. The enviorment has affect on this wood while setting. Check your opitum % for the wood you are using. If all is correct you can finish. Appply equal amount of finish to all sides and faces. The time of the year, the temperature and relative humidity will affect the material. Different parts of the country have different relative humidity reanges that you should stay within ie east coast mid atlantic region 25 to 55 relative humidity. I hope this helps.

It does help me Charles. Appreciate your reply.

When purchasing wood materials, it's a good practice to allow the material to acclimate to the new conditions.

Reply to Discussion


Need Help?

For Technical Support, please call 800-447-8638 or send a message. Reps are available Monday through Friday from 8am to 5pm CST. 


  • Add Videos
  • View All


4" Dust Port for Kreg router table fence?

Finally installed a 4" dust collection system in my shop. I'd like to find a 4" collection port for my Kreg router table (PRS1045) fence. Anybody know where I can find such an animal or one that can be modified to fit?Thanks!Continue

Tags: port, collection, dust, fence, Router

Started by E M Hampton in Other Kreg® Products Dec 2, 2022.

Kreg Circular Saw Track Guide Question

Hi all....Has anyone have experience using a Kreg circular saw track guide system for ripping long boards??? The boards would be 5 to 6 inches wide by 6 feet, I have a Bosch 4100 portable table saw. But ripping boards that length with a 45% angle…Continue

Started by Ed Anderson in Other Kreg® Products Oct 6, 2022.

Product Reviews

New Kreg 720Pro

I saw the video Kreg put out for this new jig and had high hopes for it.

I purchased one today and am very disappointed with it.

First the docking station is extremely cheap. The plastic is pathetic. A Lego has more…


Posted by Duke Leon on February 15, 2021 at 9:00pm

Not Pleased With Pocket Hole Construction

Several months ago, I purchased the Kreg K4MS so that I could build the Lego Table as outlined on the companion "buildsomething" web site which exclusively uses pocket hole construction.  I have considerable experience with conventional…


Posted by Robert Ringel on September 17, 2020 at 1:48pm — 9 Comments

© 2023   Created by KregRep.   Powered by

Badges  |  Report an Issue  |  Privacy Policy  |  Terms of Service