Fixing my tailgate from kayak damage, using "Herculiner" DYI Bed liner

Turns out Toyota Factory bed liner and Kayaks aren't good friends. I was starting to see rust marks on the naked spots of my tailgate and i needed to fix it before it was too late. So I got some Herculiner... let see what happens.

How well does Herculiner dyi bed liner work as touch-up bed liner.