LM
Hero Member
Neutralizing rust is a lot easier said than done on something as ordinary as a car frame or body panel. Ask anyone who's tried to 'paint away' a car frame with chunky structural rust how effective topcoats are on heavily flaking, rusted metal. They aren't.
On an iron cannon thats been sitting under the ocean for a few hundred years, then in the air for another hundred, its entirely possible that rust is way past the point of being treatable without taking a hand sledge to it and bashing off everything that's no longer structurally integrated, then topcoating whatever's left.
