I use this stuff a lot! You don't need to add anything to it just open the package and stretch it out to make it workable. But you kinda have to work quick! That stuff air dries really quick, what ever you don't use seal it in a plastic baggy. But make sure you squish out the air in the baggy, if you don't it will slowly dry out in the bag. You really should plan on using all of the clay once the bag is open, I think that stuff only saves up to a week. That is if you haven't opened the store packaging, if you haven't open that up it lasts a month. Once you've used that clay, I give it 10-15 hours to make sure its really dry. I warn you it will most likely crack in any rounded areas but to fix that just take some left over clay and rub it in. Painting any acrylic pant should do. But DO NOT SPRAY PAINT! If you spray paint that kind of clay it will have a chemical reaction and leak this weird turquoise goo. I speak from experience. I made a Sailor Moon wand and I used gold chrome spray paint... bad idea. I kept wiping it off for two weeks and it still wouldn't go away! Needless to say I had to throw away the wand, the goo would just not go away no matter what I did.
Hope this helped! ^_^
Florida Super Con 2009
Sat- not sure yet
Saturday night- shh, its a secret! ^_^
Sun- Crisis Core Aeris
Metro Con 2009
Friday- Crisis Core Aeris
Saturday- Sakura (Tsubasa chapter 100 sakura dress)
Sunday- Gijinka Umbreon
Team Awesome = Love and a assimilating cosplay blob!