That's odd, polymer clays are quite rough on a microscopic level so there should be plenty of tooth for the putty to cling to. Is the problem maybe that it's because it's not smoother? For that initial 'cling' a smooth surface can work better, although the bond formed with a microscopically-rough surface should be stronger.
Anyway, for larger areas you could try polishing the surface a bit with fine steel wool or the equivalent Scotchbrite. But you might only need to really smoosh the putty into place, then roll it out, cut it back etc.
m-Eastwood said:
seems to be sticking to everything but the baked sculpey.
Consistent problem with Kneadatite sticking to tools and fingers more than the model you're trying to attach it to! Even after you've gotten a good bond to the sculpt it's a common complaint that it sticks to tools tears or pulls clear of the surface.
If you're having a similar issue definitely time to try some of the lubricating options; this is the way to deal with it other than waiting for most of the curing period to elapse (not really practical in most cases).
In case you don't know, you can play with the proportions of hardener to resin with ProCreate just as you can with Kneadatite, to make a form of the putty that's naturally firmer and less sticky.
Einion