In Tim Rudman's toning book he says that some toners require a fix afterwards to prevent the image printing out over time. However, other than recommending that it should be done with straight thio rather than rapid fixer, he doesn't actually state how this should be done.

Is it just the same as fixing after development? Could anyone give me some suggested times / dilutions / tips for doing this with thio? (Up until now I've only used branded products and liquids at that!)

All assistance gratefully received!