how much paint will i need 73 chrysler new yorker brougham

[tbm3fan]

1 Gallon Sherwin-Williams Industrial Oil-base enamel
+
1 Foam roller
+
some wet sanding

Is it appropriate for a worktruck that you don't want looking like an eyesore at your house? Yes.

Low-buck way to keep rust away until the $$ arrive for a better paint job? Yes.

Would I paint a show vehicle using this method? No.

I used to use oil base enamel to paint the exterior of the Hornet. I can tell you that the areas facing the sun got dull within 4 years. That paint is now relegated to only the interior where it holds up well. The exterior must be a 2 part water based acrylic which can hold it's semi-gloss sheen for about 10 years in the salt air environment.