So one tire on my Nissan Armada (275-60-20 Goodyear SR-A) has a slow leak. I'll put it a 40 psi and after a week or so it's around 32-34 psi. Going to take it to local Goodyear next week. If they can't find a solution can I put a small amount of one of the TPMS safe canned fixaflat concoctions into the tire. I don't want' to put in the whole can, maybe 10-20% of the contents. Any reasons not to do this?