I've got some bad experiences with high temp rattle can brake disc renovation but wanted to try a new brand this time. Removed the discs and had them sand blasted before painting. Then let the paint dry 12 hours before baking the in the oven, happy girlfriend.
Been almost two months now and it's holding up really good. No signs of rust or faded/peeling paint.
I recently did my rear hubs ( not brake discs / calipers ) ... but used this. Prevously on another car had used the brushable paint, but the spray version of Hammerite Smooth produces a neater finish and is quicker to apply albeit it takes longer to mask up surrounding area.