i started a new project. decided to replace floor on trailer i got all the boards off now i need to clean up the steel a little bit. should i sand blast the trailer? the paint is all chipped and has surface rust. the trailer is only about 8-9 yrs old so it's not in that bad of shape. then how do i paint it? i do have access to a spray gun. is that the best way or could i just get some spray(can) paint.