Reply by Lee Barker

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Posted on Warping Art Piece

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Lee Barker

2170 posts in 2845 days

#1 posted 04-19-2012 01:32 PM

Interesting problem, well described.

Sometimes wood will react due to internal stresses. We can exclude that here; the pine pieces are too short and the mdf has no grain.

The poly on the back: waterborne or solvent?

My intuition tells me that the convex side would be the side that is taking moisture, but it seems more likely that the moisture would come from the glue.

I have two suggestions:

First, some experiments with MDF. Strips maybe 5 or 6 inches wide and 49 long. Try different combinations.
Could you try a strip of 5/8? It might have just enough integrity to negate the problem.

Would it be possible to glue the blocks on with contact cement?

Second, to repair: I think these will have to be laid on their face and then scored on the back 1/3 deep with a panel saw, just to weaken the backing. An external frame may still need to be applied to the back, but the weaker you can get the backing without taking its integrity, the better. The frame on the back may need to be pieces of solid stock that are actually cut with a curve to them. Dry clamp until you get the right combination of counteractive force vs. the existing curvature. This is an intuitive process, but it will work. The cuts would start an inch or two in from the edges.

I like the artwork, btw.



-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

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