A Warped Question

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Forum topic by Don posted 02-12-2011 04:27 PM 1098 views 0 times favorited 3 replies Add to Favorites Watch
View Don's profile


551 posts in 3240 days

02-12-2011 04:27 PM

Topic tags/keywords: question maple

Hi folks….

I’m in the final stages of finishing off a Maple cutting board measuring 12” x 36” x 1 1/4”. I applied the first coat of Mineral Oil and watched it disappear in seconds..thirsty little bugger. I dutifully waited the required 24 hours and applied a second coat which again was quickly absorbed. I applied the third coat and I went back to check the board later in the evening and to my shock, the board had a massive cupping action going on in the middle of the board, about 1/2” at it’s highest point.

I flipped the board and applied a heavy coat of Mineral Oil to the underside and hoped that the cupping was caused by the fact that I only applied oil to one side. Checked it this morning and the cupping is still there.

For those who have experienced this or may be able to shed some light on the problem, will this go away with more applications of Mineral Oil to the underside or am I stuck with a 12” x 36” springboard?


-- -- Don in Ottawa,

3 replies so far

View Chelios's profile


568 posts in 3064 days

#1 posted 02-12-2011 04:39 PM

Apply oil to all surfaces of the board to minimize the chances of this happening in the future. Same goes with other finishes. Apply to all surfaces to avoid movement. I am not saying that this is always the case but provided your designs allow for movement then finishing all surfaces is something to never forget.


To fix it try putting on more mineral oil until it is saturated and try clamping down with soft pressure over a day or two at a time tightening down every 8 hrs to return it to its original shape.

View Steelmum's profile


355 posts in 3961 days

#2 posted 02-12-2011 04:57 PM

This is a silly little question, Did you make it out in an unheated shop, bring it in and apply mineral oil? Could it be a case of not waiting for the wood to acclimate to temperature and humidity differences? Central heat is usually dry. Just something to consider.

-- Berta in NC

View Don's profile


551 posts in 3240 days

#3 posted 02-12-2011 05:43 PM

Hey Berta…at first I thought you were saying mine was a silly question :o)

The shop is heated and the board sat in my basement for about 24 hours before the first coat. It’s pretty dry here in the winter and I don’t have a humidifier hooked up so it certainly be the lack of moisture in the air. Just strange that I didn’t notice it until after the third coat.

Like I said, I flipped it and applied a generous coat last night. I have another heavy coat on it right now and have the ends clamped with a 1/2” bridge in the middle to see if I can coax it flat again. Problem is, my finishing table is a plastic folding one so it kind of bends in the middle when clamping….I may have to beef up the table to get a nice flat and rigid surface to clamp to.

-- -- Don in Ottawa,

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