Bending with rollers To make curved panels the best system is using a bending machine with 3/4 rollers. To avoid risk of damage, attention must be paid to the minimum radius of the curve of the internal side. In the case of STACBOND® composite panels with flaps, the minimum recommended radius is 500 mm for a maximum flap length of 20 mm. Finishes Transformation Mounting Systems STACBOND® composite panel Coil coating