What's 1/4" thick and flexible?

[atgcpaul]

I goofed on my bending form. I've decided to go with an 1" thick lamination
rather than 1 1/4". The form was cut for 1 1/4" and I need to make up for the
extra 1/4" with something flexible--but firm. I don't have enough extra wood
strips to pad the gap. It has to bend around a 10" radius and needs to be
a continuous 5' long.

Thanks,
Paul

[jAngiel]

I don't know if it would help you but I plan on using some hardi plank siding for some concrete forms because it bends easily. I think it's about 1/4 inch thick.

Will 1/4 mdf work? It should be closer to 1/4 inch than 1/4 inch ply.

[RayintheUK]

Masonite?

Ray.

[JR]

Two strips of 1/8" hardboard.