Highly diluted spray-on wax, such as at a car wash, is fine if you like wax on your glass, wax on your rubber, etc, and don't expect any lasting protection. Even the most lovingly applied, finest quality carnuba wax is a thin, sacraficial layer and will only protect paint 60-90 days, depending on how the car is stored. If your concern is not having to protect the paint often, then use an acrylic. But don't expect something that sprays on with a garden hose to protect your paint.

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Richard Detoy
'84 300SD
'76 Moto Guzzi 850 Le Mans