I baked an sd dial in the oven. started at 200 and slowly raised the temp. It didn't start working until 325. By the time it changed to where I wanted it, the paint on the dial started to pop and bubble a bit. I left it in a little too long. It did work though. I also put the insert into a bleach bath, rinsed it, then ground up a chlorine tablet and added it to some hot water. I swished the insert upside down in that for a couple of hours. It did have an effect. The granules of chlorine acted as a sand abrasive, as well as fading the insert. If I hadn't of broken the stem while reassembling, I would have had the watch back together. It looks pretty good for a first attempt at this stuff. Anyone have a spare stem for a 21jA?