Time to get out the Reciprocating Saw?

[CrisL]

Although I have never tried it, maybe a little anti-seize or anti-galling compound spread on the rails will work. Some of these compounds are specifically made to prevent stainless steel from seizing when in contact with other metals.

[Poconos]

Something to remember about grounding in this particular case, and from a practical viewpoint....the only way a ladder can get 'hot' is if something contacts it from above like a bare wire on an extension cord. If you're working like this you shouldn't be in the water. Even with paint, grease, or anything else, you should still get continuity through the anchors or whatever they're called, that tighten the rails in place. grounding things 'underground' are a different issue because of voltage gradients that can exist in the earth.
Al