Ken,
metal figures are fairly immune to oven cleaner. I have stripped some resin figures, I dare say most would not suffer too much. It would depend on the resin, how long they they are covered/ soaked in the oven cleaner.
I did strip one figure multiple times, the worst was a few pin holes. I have no idea what resin it was though.
high strength paint strippers are fairly aggressive, and can deform or even eat a resin figure.
there are some larger scale figures out there that are made of injected plastic; cheap starting points, no great investment, and ok test beds for techniques, ideas and so forth.
I'll leave a message on your page, rather then hijack your informative thread on sculpting
cheers