How to get a different shape on the countertop with form plywood?

[toker78]

I want my countertop that I am going to cast to have a slightly different shape partly because the wall is a bit angled where the stove is but also because I don't want it to look like just any concrete countertop.

I should probably use form plywood but how do you get the curved parts, can you bend form plywood that much or is there something else that works just as well to cast "with/in"?

 

[zankan]

you use 4 mm plywood and make the arches from it. Alternatively, you can scarf plank in a square arch and saw out the correct radius.

 

[Watchmen]

Is there 4mm formplywood? 6mm works perfectly for round shapes otherwise