As a Professional string builder here are some good guide lines.
String material is a synthetic material or plastic.
String material comes coated with wax (so each strand is coated)
Servings are not coated in wax
Serving should not be waxed. Why because wax is sticky and will attract dirt into the cams, etc, etc
Heat is not good for a string Sun, hair dryer, Heat gun etc etc. Why because it distorts the string material and damages it.
Over waxing is not good it attracts dirt and builds up and stiffens the string material.
General rule of thumb for waxing your string, wax it when the material starts to fuzz. Simple its what the pros do! No need to go over board. When you have shot enough and the string shows fuzzing wax it.