12" radius
On my first trailer I ripped Schedule-40 PVC pipe in half with a circular saw and used the inside surface as a mold to make wet layups of radius sections.
Triple waxed,and Polyvinyl Alcohol,and the parts came out with little prep work required before prime and topcoat.
A children's green ABS outdoor play slide might be about the right size for you.Sometimes you see them at yard sales and flea markets.
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