I have an older HO 40ft plastic drop-bottom gondola (AHM maybe) that I want to re-detail and letter for the C&EI.

The problem is it developed an upwards hump/warp in the middle. The whole car body warped up about 3/32", while packed away for a long spell.

I think I remember it mentioned on this list about how to heat-up a plastic car like this and re-flatten it out, like in an oven at 100 deg.? maybe?

Any suggestions about how to do this correctly? I don't want to wind up with a melted experimentation on my own.

Thanks, Paul Hillman