Dont use Rhino on your frame.
I worked in a Restoration shop, used POR15(Paint over Rust 15) and rhino lined trucks for extra income. Rhino is a good product, but it wont last on a frame. It WILL tear off.
Never por-15 a jeep before, but I did do a few datsuns, vw etc. Its not horribly complicated, but it is time consuming. Also, the outcome is based on how good you are w/ a paintbrush. To do it right, your gonna want to strip the jeep (tub off). The outcome is worth it though. It does what it says, and its darn durable (Wear Gloves!
) They make regular steel (black), silver aluminum, then different colors for steel, such as silver (for old brake lines etc.) and custom colors. We POR15d a datsuns engine block the same color as the car. Ask Penguin_in_a_cj how well that one turned out