I know a guy that sprayed his Chevy pickup bed. When I saw him and asked how it turned out, he said "OK, but I'll never do that again". I'm not sure exactly what he meant by that but I took it to mean it wasn't an easy job to do and likely didn't save a lot of money after he factored in the time it takes and the clothing you throw away. Kind of like seal coating an asphalt driveway. You buy the 5 gallon pails of sealer and the applicator and think you're saving a lot of money. When you're done you buy a new shirt, new pants, new shoes and realize you saved nothing and it took up your whole day.