I painted a relatively small spot, nonmagnetic, about 3 x 2 ft. I never thought about how long it will last. I just figured it would be as long as other paints,

I painted a relatively small spot, nonmagnetic, about 3 x 2 ft. I never thought about how long it will last. I just figured it would be as long as other paints, many many years with possible touch-ups. Call the company's customer support and ask. The way I see it. It's relatively cheap so it can't hurt to try it.