How do I fix latex roads that are warping/curling?

[cram]

A couple of sections of latex roads I own have warped/curled quite badly on the side edges, which are very thin, and I'm wondering how best to go about flattening them out? I've tried rolling up the the piece against the curl to try to correct this, and I've tried laying heavy books on top of the road section overnight in the hope it would flatten it out, but both methods have failed.

Anyone know of a way to remedy this issue?

Many thanks for any help.

[robh]

[Mr.J]

I’ve seen it suggested that sticking duct tape to the bottom helps lend rigidity and pulls them back into shape.

[cram]

Thanks for the help guys.