Paint each side of dry wood with unthickened epoxy so it will be absorbed.
Wait a few minutes but don't let it cure. Then put a thin layer of
thickened epoxy and clamp just tightly enough to achieve the shape you need
and to mimimize any gaps. The thickened epoxy is just a gap filler and the
gaps are supposed to be very minor. If the gaps are too large then the
epoxy would form hard spots. I'd use fumed silica for thickener. The
thicker you make it the faster it cures - can be too fast to work with so
thicken only enough so it doesn't run and will act like a gap filler.