The slow leak could be caused
anywhere from a nail in
the tire or a bent rim.
The tire and rim should be looked at by your mechanic as
soon as the leak is noticed.
Otherwise if the tire does happen to fail while you are
driving,
causing a blowout, you could lose control of your car
causing
injury to yourself and others.
If you can replace the tire
yourself, make sure that you have
a good jack and the proper lug wrench on hand.
If you have to pull over, try to find the safest location
away
from traffic.
Tire sealants like Fix-A-Flat
is only useful if you've got a slow leak
in the tire or a small hole, and provide a temporary
solution until
you can drive to a safe location to change your tire or get
to the
shop to have it repaired or changed.
Fix-A-Flat works by injecting a
liquid sealant into your
flat tire to seal the leak, and a gas to fill the rest of
the tire.
The sealant leaves a big mess
inside, its liquids creates cobweb
like slime which gets around inside the tire, and it's a
real hassle for the mechanic to get all of it off the tire
and rim
when they do a tire repair, especially if it's dried on.
Tire sealants are especially
bad in the Winter, it can freeze
inside your tire, knocking your wheel out of balance.