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Thanks for the suggestion but the curved panel needs to be as stiff as 18 mm flat plywood. The requirement comes from the need to keep the lowest resonant frequency of the structure above a particular frequency where it will not get driven by vibration. I don't think I have much wiggle room.

Thanks that is encouraging. I presume it was a tighter radius than 150mm? and what thickness was the plywood? It was normal plywood and not the flexi-ply with the soft core?

I am looking for curved panels with a radius of 150 mm and the stiffness of flat 18 mm plywood sheets. 1.5 mm 3 ply aircraft plywood looks good but is too expensive. 3 mm 3 ply marine plywood is just about affordable but is the radius too small? Table 1-2 on page 1-25 [of an old aeroplane manual...

I applied a fairly thin first layer of danish oil to a pine kitchen table. The next day I had six small black pits about the size of pin heads and a small pile of what I took to be dropped plant soil (although this was denied!). After cleaning it up and sanding there was a blackened pit slightly...