In addition to the paint quality there are is maintenance which needs to be considered. Cast iron drainage systems, like any other quality products, require ongoing maintenance. This maintenance is straight forward, uncomplicated and only required once a year. We recommend this is carried out in late autumn after leaf fall and before winter sets in. There are four simple checks;
Check gutters are not blocked with leaves, moss debris etc. If they are a brush should be enough to remove them.
Check fittings and brackets are still secure.
Check the paint finish is showing no signs of rust. If there is, sand down the affected area to bare metal, clean, dry and apply touch up paint to the area.
Check there are no leaks, where the gutters are jointed to other gutters or fittings, with a simple visual inspection.
These inspection requirements should apply whatever rainwater system you choose because regardless of what you might be told, no gutters or pipes are maintenance free.