This is a description of a jerry rigged solution for storing chemicals that settle and are consequently, rather difficult to remix. Silicone catalysts fall under this category. Certainly there are probably a number of solutions for this that one might purchase at a laboratory supply company or whatever. I haven't looked, but laboratory equipment tends to be expensive anyway. I put this together for under $10.
Basically when storing various materials, they invariably settle and need to be remixed before use. This can be seen with anything ranging from house paint, wood finishes, the catalysts (mentioned earlier) or even food products. The point is that if your materials are stored on something that keeps them relatively mixed, you don't have to deal with caking and wasting time and aggravation getting the stuff to become usable. If you've ever dealt with silicone catalysts, getting them to thoroughly mix after sitting stagnant on a shelf for some time is annoying. You want to spend more time on art than dealing with odd quirks associated with materials.
OK - So if you have some mechanical aptitude or know a mechanical engineer, this isn't too difficult to assemble. Many things can work to achieve the same result. These images show a base made of MDF (which I already had laying around). There are some cylinders that I think may have been used in the mechanics for a pull down map or screen in a school or something (the gears came with them). I bought those at a resale shop for $.50. I bought these at a place that sells used construction materials called Construction Junction here in Pittsburgh. The motor is a 6 rpm 110 volt motor which is generally used in microwave ovens to rotate the glass platform. I bought these on ebay from 'HUBERY LU: Light U Dream, Fly Yourself'.
This works fairly well. The bottles have a tendency to walk a little bit. So, placing a kind of stopper would help to ensure that they stay put. I will probably put this one on a timer so as not to burn out the motor. Running anything 24/7 is not a great idea. Obviously, you'd want to keep it in a place that would minimize damage and spillage with relationship to other stuff you have in the studio. Sealing the caps with electrical tape is a really good idea.
2014-01-18 I've been using it for a little over a week. Working like a charm. Storing chemicals on it and keeping it on a timer. Every half hour it rotates for a half hour and keeps things like catalyst and water based vinyl suspended. Wish I would have done it sooner.