G'Day, Boss69Hogg,
I've been using Mr Sheen, or the lower priced alternatives for 20 years on all my cars without problems. It is basically a spray on silicone and can also be used on side and rear windows and mirrors to help disperse water. I give my cars a proper polish once per year and use Mr Sheen on them every 2nd wash. Bog easy to use and protects well. Your average spray painter will hate it unless they know to use a silicone remover prior to any repairs.
Another tip which I,ve only recently found is to remove dried on well cooked bugs from your car, give them a good soaking in WD 40 or RP7 both work well. I do 10 or 15 mins prior to washing the car.
Cheers, Ron B