I'm currently doing a small experiment with the ADCs, fluidized them, harden them up, and so on. I also experiment on my own sand clay recipes too! :) But there will not be any new item from the experiment to show here yet. I'll have to wait until next weekend to be able to 'play' again.
OK, now let's talk about ADC tips. You know that ADC dry up when it exposes to air. However, they clay drying rate also increase once you mix the color to the clay. It doesn't matter how tight you seal your bag, it dries. I think it's kind of chemical reaction between the clay and color compositions which speed up the drying process. But this doesn't mean the clay will dry in a heart beat. I mean, normally you may keep the clay for months while the colorized clay will only last for a few weeks. So, it's good to make a plan on making things and amount of clay to be colorized for each use.
Clay and tools, with Fimo and other PC. Once it comes to time you play with tools, you will need cornstarch or talcum powder to powder/coat you tools to prevent the stickiness and gluing effect between the clay and tools. What about ADC? It's not much different. With ADC you can also use talc or cornstarch or dense/rich hand cream - in many CP recipes/tutorials the suggestion is cold cream.
Now, get ready, grab stuff around and see if you can use some for your mini making/sculpturing 'tools'. Have fun! ;)