The age old water beading test is an easy way to check this. Spray your car with a hose and take a close look at how the water behaves on the surface. If it beads up nicely, then your last wax job is still hanging in there. If the water doesn’t bead at all and forms large “sheets” on the surface, it’s time for a wax.
Why wax your car?
Some people see waxing their car as something special they do once in a while. The truth of the matter is that routinely waxing your car is as important to the condition of the exterior as an oil change is to the motor. Routine waxing will keep your car looking great and it will preserve the resale value. Waxing is not just a cosmetic benefit because it protects the paint and prevents oxidation that can destroy the resale value.
How often should you wax your car?
Like most things in life “as often as necessary, but no more than that.” The reality is that how long the wax lasts depends on the exposure the car gets. A car parked in a garage could last for a year or more but normal use exposes the paint surface to bird droppings, wind, tree sap, and locally we have the salt air to deal with. If the car is parked outdoors even in our mild climate most wax will start breaking down in less than 6 months. Consult your owner’s manual for recommendations on your specific vehicle.