Duracoat on a Krag. What's next, Krylon on a Trapdoor?
Certainly not my cup of tea but the owner seems pretty proud of his handiwork. Note that the rifle in question is a cut-down Model 1896 (look at the bolt handle recess) which means that it is legally an Antique made in 1898 or before. Thus it can be legally transferred interstate without an FFL, and also owned / transferred without registration in jurisdictions that control intrastate sales between private parties. Although the seller doesn't mention it, building an "exempt" all-weather survival gun would be about the only reasonable justification I can think of for that kind of finish.
Cheers,
Peconga in Boise, Idaho