One of the challenges with anodizing is finish preparation prior to the actual procedure. Using a polish wheel is one option, but its very cumbersome. Another option is to use a vibratory tumbler. Below is my first experiment with the tumbler. The green fragments are fiberglass resin. You can see the circulatory motion as the parts move around.
The first experiment had a rusted gear holder (steel) and a sample piece of 6061 aluminum. You can see the progression in the picture below. The time frames are 15m, 1h, 2h, and 3h. Much of the rust has been removed. The aluminum polished well up until it became impregnated with the fiberglass. My next test will be to use ceramics, then fiberglass, then walnut shells. Stay tuned.