If you have a week off, why not remove them to paint them? When was the last time you changed the brake fluid? If it's time, you kill 2 birds as it were.
The G2 kit is pretty good, I went with red. It is an epoxy paint so you have a limited window once you add the catalyst (4 Hrs.) which is why removing the calipers maybe makes it a little easier. I was able to do 3 coats before the paint become too difficult to work with.
I got some bolts from Loews which matched the thread/pitch of the brake line taps on the calipers and mounted them on a 1X4. This way, I didn't have to handle them and could turn them over and such giving a really smooth finish.
But prep is the key to a good job. A wire brush and plenty of brake cleaner and rags. Plan on spending more time on prep (probably twice to three times as much) than actual painting if you want a good looking, lasting, finish.
IIRC, I went with the 6mm decals. 3 yrs. later, the calipers are still shiny and colorfast and the decals show nosign of degrading.
The only thing I wish I'd done was to paint the hats at the same time, consider this too.
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