We usePOR-15 in the shop when working with old vehicles and this stuff is amazing. It really works, no snake oil here.  It is tough, we brush iton the underside of pans and beds and often spray the frames.  We likeit better than powder coating for simple reason that you can go back andtouch up if you want to make a change, or get a scratch.  Wear gloves!!! This stuff hangs on for a long time!

POR-15^® is a high-tech, high performance rust-preventive paint-like coatingdesigned for application directly on rusted or seasoned metal surfaces. Itdries to an incredible rock-hard, non-porous finish that won't chip, crack, or peel, and it prevents rust from recurring by protecting metal from further exposure to moisture.   It works by isolating metal from moisture. Without moisture present, steelcan't rust.  POR-15^® acts as a total rust inhibitor and is also very effective as a metal filler.It's consistency is approximately that of paint and it has very good spreadability(one quart covers 96 square feet).

Use it to coat rusty frames,floor pans, wheels, bumpers, roll bars, or even a heavily corroded batterytray.

POR-15^® is sensitive to UV light (sun) and must be topcoated for prolonged exposureto sunlight.
Topcoating is not required for areas not exposed to sunlight.