POR Patch is a highly concentrated version of POR 15 Rust Preventive Paint, it comes in a tube, and has a consistency of toothpaste, making it an effective metal filler.  A cured mass of POR Patch is virtually indestructible, yet it remains flexible and won't chip or crack. Once dry it is totally impervious to fuels and solvents. It will fill holes in steel, wood, plastic; it is waterproof and non-porous. As a moisture barrier, POR Patch is unsurpassed, and it's
bonding characteristics to cured concrete far exceed those of cement and other patching compounds.

POR Patch is easier and less expensive to apply than epoxies because it doesn't require mixing. An application of POR Patch will not only cover up the rust and prevent it from spreading, but will strengthen the underlying metal and seals holes by forming it's own membrane.