I went to a local parts store to buy some #26 and they were out of the paste wax which usually comes in a plastic container with a foam applicator. I asked the clerk at the counter if they had any more in the back and he went and brought back a tin can of this stuff. I bought it because it looks kind of cool, but now I'm not sure if I should use it or keep it and buy another newer container. How long is wax good for? Is this the same formula as the newer conatiner? Is there a way to figure out how old this wax is?