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Reply by Lazyman

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Posted on Stumped with Arm-R-Seal

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Lazyman

3977 posts in 1898 days


#1 posted 06-01-2018 03:59 PM

I got curious and after doing a little research, this sounds like classic PVA glue creep, though I have never see this myself. Some of the usual suspects are:

  • Wood was not dry enough at the start (10% or less)
  • Not waiting long enough (a week is recommended by some) after glue-up to let glue moisture escape and wood to stabilize before applying a sealing finish
  • Significant moisture swings
  • Joints between different types of wood and/or different grain orientations

Unfortunately, MC changes can cause this over time even if you have done everything right. Supposedly, hide glue won’t do this but PVA is notorious for it under the right (wrong) conditions. Short of striping off the finish and letting the top stabilize, there may be nothing else you can do.

Did you seal the underside of the table top? If not, that could play a role, especially since you said that the humidity has been high lately.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.


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