SAVE YOUR MONEY....
Don't put anything into a tire to prevent a flat nor to repair one.
First of all anything you can put into a tire to prevent a flat must be in some form that can freely move or flow around inside the tire. This movement will destroy any wheel balance.
Fix-A-Flat is CRAP. It is a corrosive acid based chemical and will ruin the inside of a wheel in very short order not to mention the wheel balance. It is very doubtful that this crap will do anything for the flat tire and I can promise you it won't "FIX" it. If for some stupid reason a person was to use this Fix-A-Flat crap
PLEASE, PLEASE, PLEASE inform the Tire Tech that you have used Fix-A-Flat. As he breaks the tire down there is always a little trapped air escaping under force. This Fix-A-Flat crap will be forced out of the tire possibly directly into the Tech's face. So again,
PLEASE, PLEASE, PLEASE inform the Tire Tech that you have used this Fix-A-Flat crap.
One other thing, NO can of Fix-A-Flat can inflate your trailer or tow vehicle tires to an inflation pressure that would be safe to continue driving.
If you have a flat put on the spare or have road service such as
Good Sam's ERS.
I spent many years and my brother still is in the
tire business and I know from where I speak. But if you want a second opinion go to any reputable tire shop and ask them.
AND while on the subject of flats,
NEVER EVER PLUG A TIRE! The only good tire repair is a patch and/or plug combination installed from inside the dismantled tire. There is absoultely
NO WAY anyone can inspect the damage to the inside of a tire by shoving some piece of rubber in from the outside.
I have found large nails still sticking in the tire. From the outside it looked pretty much like that was the only problem. After dismantling the tire from the wheel we found the nail had moved around destroying the inner liner. On the inside of all tubeless tires is a rubber liner which took the place of the old inner tube. It is this rubber liner you want to repair not the tread area. As you can't see this liner while the tire is still on the wheel you
CANNOT repair the tire with any confidence that it will not leak. To prove this point ask any Tire Tech(I'm using the term "Tire Tech"loosely) installing such a plug from the outside if he guarantees the tire will not leak.
NO REPUTABLE tire dealer repairs a tire by inserting a plug from the outside. Again, you don't have to believe me, go get that second opinion and that second opinion can come from
no one but a reputable tire dealer.
This is a lot more info than you were looking for but I feel too strongly about the tires we are not only hauling our Montanas with but we are also hauling our loved ones on these tires. Be it you, your spouse, your children or grandchildren tires are not the place to be concerned about the cost of a flat repair.