Cleaning the oxidation from the bore and polishing the pistons does, indeed, have some affect on sticking. All seals and o-rings have been newly replaced.
I have a complete caliper but the cylinders have oxidized to the point that I can't clean or buff them sufficiently enough to keep the pistons from seizing after setting just a short while. Does anyone know a foolproof way to ever so slightly hone the cylinder walls or otherwise clean them...