Oogoo is a mix of 100% silicone caulk and corn starch. The corn starch evenly distributes moisture which it has absorbed from the air. This helps to activate the polymerization of the silicone in a controlled way. So, unlike regular caulk which can take days to set up, Oogoo can set up in an hour or two no matter how thick it is cast.
For these projects you only need a few materials:
100% silicone caulk-the type that smells like vinegar and has no acrylic or latex additives. The newer silicone caulks that have a different smell such as GE silicone II will not work for this.Available from Walmart or the dollar store for about $3.
1/16" and 1/8" thick plastic sheet material. PVC, polycarbonate, acrylic or any other plastic sheet material can be used. Plywood sprayed with lacquer can also be used.
Spray Lacquer from hardware store.
Naphtha or Turpentine solvent from hardware store
Artists oil paint (optional)
The Standard Oogoo Mix
The standard mix of Oogoo consists of 2 silicone caulk to 1 corn starch by volume. It is usually mixed in small quantities so that it can be formed or cast before it starts to stiffen up. I will typically mix no more than 3 tablespoons of silicone caulk to 1-1/2 tablespoons of corn starch. For more details on mixing Oogoo see here: http://www.instructables.com/id/How-To-Make-Your-Own-Sugru-Substitute/
While mixing, Oogoo will give off the strong smell of Acetic acid which can be irritating to the eyes and respiratory system. I strongly recommend that the mixing and forming be done outside or in a VERY WELL VENTILATED room. You should also wear nitrile gloves while mixing as the uncured silicone contains other solvents that might be absorbed by the skin.