It s useful to have a range of tools scrapers wire brushes different grades of abrasives sandpaper not sand it s usually particles of aluminium oxide or whatever abrasives you use.
Cast iron gutter repair paint.
Evo stik metal epoxy putty.
Gutter repair tape is a thin layer of foil coated with a layer of bituminous adhesive often on both sides of the tape.
These gutter lining paints are specialist coatings that ensure all surfaces are waterproofed and uv protected preventing leaks for up to 20 years product dependant.
The primer is absolutely necessary otherwise the paint itself might deteriorate the gutter itself.
The smoother the surface the better the patch will adhere to the surrounding metal.
After cleaning your gutters and leaving them dry for an entire day you can start applying a coat of primer.
The undercoat acts as a preparatory coating on the guttering surface increasing the stickiness and durability.
Remove all gubbins dirt flaking paint and rust from the cast iron.