In between staring at the completed dash and numerous coffee's I decided to finally get my hands dirty and refurbish the calipers. I'm using a four part POR15 kit. Today I managed to strip them down (well, as much as I was going to), clean them and get them to a stage where the first coat could go on.
The plan now (according to the instructions) is to paint them first with ordinary POR15, wait for that to become tacky, then apply the first coat of caliper paint. Wait 3-4hrs then apply a second coat of caliper paint. That is for another day...