Use the proper stuff, halfords ripspeed flog it, it drys quickly and is heat resistant which means it will last. its 2 part epoxy so its really tough.
you also get sh*t loads of it, cos its aimed at dare i say boy racers who want to paint there drums ( nice ).
Meant to wait a day for it to dry properly, b****cks just wait for it to be touch dry and drive off, i did, its still on there.
personally think colours look a little cack unless they are decent calipers, i dont know what they are on a 172, its all down to personal taste isnt it.
Mine are black, so look clean and tidy without drawing attention to them.