These are some of the factors that will affect the protective layer applied to a paint surface
1. Thickness of applied Coating
This barrier is all that stands between the environmental contaminants and the paint film surface and this renewable barrier is probably less than 0.1 ? (100 nm, 0.000 4 Mils or 0.000 004 inch) thick. An applied paint protection product is the barrier that provides protection for automotive paintwork besides the clear coat paint.
2. Fracture/evaporation temperatures
[: the melting point of a solid is the temperature range at which it changes state from solid to liquid. At the melting point the solid and liquid phase exists in equilibrium.]
Polymers (including Acrylic polymers) 350.?F, Silicone oil 350.?F, Mineral oils 200.?F, Synthetic blends (Carnauba wax / polymers) 200.?F, Carnauba wax 183.?F, Bee?s wax 130.?F in actual practice the high temperatures frequently encountered by vehicles from the radiation causes wax compounds to melt.
For example, painted surfaces exposed to ambient temperatures of 85. ?F in direct sunlight will obtain a temperature of 195. ?F or more. It should be noted that there is a range of temperatures at which melting begins and that the 'melting point' is the end point of that range
3.The rate of environmental exposure that negatively effects (clear coat) paint varies widely with ambient conditions (UV radiation, Environmental Fall-out, paint protection used, etc) but an approximation of 0.005Mil (0.13?) per annum is about average; protective coatings polymer sealants, wax, etc), being renewable are meant to be sacrificial (it is subjected to oxidation, thereby by saving the clear coat)
4. + Rainfall, how often its washed, - how often a quick detailer (QD) or spray wax is used
5. The rate of evaporation would be dependent upon the surface colour and environmental conditions (mainly UV radiation).
If left in an enclosed, insulated garage you would remove most things that have a negative impact on a wax / polymer sealant. Evapouration requires heat so I'm going to say, and this may be a little scientific or too profound a technical answer for many....
Not much