Re: How to do a perfect circle GITD powder.
Whenever I've added glow epoxy to a light, it's usually been around an LED on a heatsink. Usually the LED sits ona circular raised pedestal. I would use some Scotch tape to tape around the pedestal carefully to make a "bowl" for the glow epoxy. I would also use a piece of heatshrink (unshrunk, just a tube sticking up) around the LED dome just to make sure I didn't drip any epoxy on it. After I mixed up the glow epoxy, I would carefully dribble it into the "bowl" in little batches. It would mostly level itself. Just fill to the proper level. Sometimes, actually most of the time, I would hit one of the edges as it was dribbling in and run down the side of the "bowl". That always leaves a little trail but is easily cleaned up later.
Once the epoxy sets, you can pull off the outer edge tape and the inner edge shrink tube, and you have a pefectly round glow dot. The trails mentioned earlier may come off with the tape or may be left behind sticking up out of the nice even top. The good thing is they are usually pretty thin and can easily be cut off with a razor blade or exacto knife. If you pour the epoxy a little too high, it can be sanded down with a Deremel tool, but be careful not to hit the LED dome.
