My S10 pickup has some really good tires on it now but one has developed a very slow leak in it. I would guess it leaks maybe 10-15 psi in two weeks. I don't drive the truck much and it's a pain to have to air up the tire every time. I have checked it for nails etc but can't find anything. Is there anything I can put in the tire to seal it that won't rust my wheel? I thought about a can of fix a flat but I've always heard it will rust the rims. Thanks in advance for the replies.