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If that's all you did then it will wind up warping. Generally the pasted side becomes concave so the blade will only touch the edges. The wood needs to be glued to something stout and non-warpable....

I use a slab of poplar glued to an 8x3 bathroom tile, then lapped flat. Works wonderfully well, and no convexing no matter how many laps you give it. I've got one with chrome oxide and another for...