I used a bit of heat on the stab tonight thinking I was wasting my time but it straightened out. Now if it stays over the next couple of days we can either fill it with hydrostone using a tumbling method to get a 1/4" coat. Or I have some urethane plastic that is going to expire and that will make it solid enough to keep it from deforming while I add finishing putty to the fuselage so I can blend the dents and ridges.
I don't know why they used gobs of urethane resin and a single layer of cloth and expected it not to shift. Sure makes you appreciate those heavy white gel coat fuselages.

Tim