I'll tell you something to try first. Hydro2 is a polymer coating out of South Korea. Available on Amazon. They make a direct to surface, a concentrated, and a foaming wash and wax. It's good stuff for a fraction of the cost of ceramic. With the polymer alone you apply it with a pump up spayer and immediately rinse it off with a pressure washer. The more pressure the better it bonds. It's amazing stuff. I use the foaming wash and wax in a foam cannon to wash all my vehicles now, even the motor home. Spray it on, brush or hand wash, and rinse it off with the pressure washer. Its simple. I can wash/wax a 40ft Motorhomes in under an hour. Closest description I can come up with is Rain-X for your paint and it last six plus months.