To paint the INSIDE of a gas can?

The purpose is to discourage rust and flaking of current paint.
I figure I can get a quart, pour it in the can, slosh it all about, then
drain.

Else hire a team of hamsters with itty-bitty brushes.

Prior to painting, I plan to place rocks and sand in the can and shake it
like mad as a substitute for sanding.

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Because it's a military jerry can dated "Sep 1943" and has stenciled on it
"III Army," which I assume was Patton's outfit. It will have a certain irony
when used here with the Minutemen Project in South Texas.