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yes. If you spray, mask everything off well. If you brush, I recommend using a roller on the larger sections to get a smoother looking finish.
*Prep work is critical to a successful paint job. Clean and degrease thoroughly
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this ^^^ prep is most important, but at the same time NOTHING will stand up to a 4500lb rig getting drug over rocks. not even the almighty powdercoat. Best and easiest way to prep is to go to your local parts house and ask for a couple "red" scuff pads, they are very abrasive, so dont hit anything you dont want to scratch. Get under the rig with a hose and a bottle of dawn dish detergent and scuff like theres no tomorrow, then when you think you are done, go over all of it again, then you should be good. If you use the POR, just go at it, but if you are going to rattle can it, get a product that either says "etching" or "direct to metal" either of these will bite into the surface and make your topcoat of whatever color you choose last a lil longer. Use light coats too, this is where everyone screws up, dont get in a hurry, take your time. If the tub thing still bothers you, ask your dad or parents or whatever if you can just unbolt the tub and lift it far enough up to get a lil more room. Good luck