Too late to finish underside of these boards?

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Forum topic by Keith Kelly posted 01-13-2016 03:03 AM 824 views 0 times favorited 4 replies Add to Favorites Watch
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Keith Kelly

263 posts in 1686 days

01-13-2016 03:03 AM

I’m assembling a wall shelf I built for an unused space behind a door in my house. I used Water-borne EnduroVar on these pieces, and put 1-2 coats on the bottom, and 4-5 coats on the top. Now that it’s up, I see that each shelf is convex upwards a bit (upwards like a saddle).

The shelves are loose right now, as I plan on taking them back into the garage after a few days to rub out the finish anyway. Point is, should I go ahead and add some coats to the bottom now? Or, would that make the cupped shape permanent?

apparently we don’t paint behind our trim

-- Keith - Bolivar, Missouri,

4 replies so far

View rwe2156's profile


2961 posts in 1504 days

#1 posted 01-13-2016 12:52 PM

I don’t think it will affect the bow that’s probably there to stay.

-- Everything is a prototype thats why its one of a kind!!

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Keith Kelly

263 posts in 1686 days

#2 posted 01-19-2016 11:08 PM

So I created a sauna in my bathroom with hot water and a humidifier. The Sassafras shelf (the most cupped) is now pretty darn straight after about 2 hours.

My plan is to take that to the garage, and apply a nice thick coat of finish real quick.

Bad idea?

-- Keith - Bolivar, Missouri,

View johnstoneb's profile


2932 posts in 2196 days

#3 posted 01-19-2016 11:15 PM

Finish won’t stop a board from cupping. It will slow it down but if the board is going to cup it will cup.

-- Bruce, Boise, ID

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Keith Kelly

263 posts in 1686 days

#4 posted 01-19-2016 11:34 PM

Interesting. Here’s my thought process:

They were flat when I began finishing them. I’m thinking that since I finished them off-balance (top thicker than bottom), in the coldish garage….. then, moved them inside to a warm/heated zone, that the inside climate allowed a bit more moisture loss from the wood, which would have happened at an uneven rate.

Therefore, if I increase the humidity, the board should take in humidity at a higher rate on the less finished side and possibly flatten back out (which it seems to be doing)

So, if I put an additional layer on the bottom to bring the thickness closer to the top, it seems that when it then acclimates to the more normal climate, it should do so at a more even rate on each side and therefore achieve a less cupped state.

Note: really, these aren’t cupped crazy bad anyway. I’m primarily doing this as an experiment to better understand wood movement.

-- Keith - Bolivar, Missouri,

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