In Hawaii, a sunny climate is usually taken for granted. If you work or play or volunteer your time outdoors, it's a good idea to put on protective sunscreen lotion. If you don't & stay out too long, there's a good chance you can get burned. You should think about your car in the same way. Have you ever noticed the cars driving around with large dull patches on their hoods, trunks &/or roofs? These are often because the "clear coat", that protective clear layer of paint covering the "base coat" or color of your vehicle has worn through. The best line of defense against sun damage is, of course, to keep your car in the shade (like a covered garage) during the day. However, this is not practical for the great majority of us here who rely on our vehicles to get to work or school or one errand or another throughout the day. Therefore, the next best alternative is to keep a good protective coating on your vehicle. If I don't put on sunscreen, I get burned. It's the same with my cars paint. It's a good idea to replace a premium carnauba wax within every 3 months under normal conditions if your vehicle is out in the sun every day. On the other hand, if your car is garage kept almost all the time during the day you can probably go as much as 10 months to a year before having to replace that same premium wax. Have you ever noticed the cracks that develop in the dash of some vehicles? It's a good idea to keep your interior surfaces protected as well. Regular applications of conditioner & protectant can help to keep your leather & vinyl from drying out & cracking. For your carpeting, pockets, vents & interior crevices, how often you would like to have your car detailed will really depend on your lifestyle & how important it is to you to maintain a great looking vehicle. On average, I've noticed that guys tend to care more about the exterior of their cars, women tend to care more about the interiors. Not true in every case I'm sure, but just something I've noticed more often than not. Something to keep in mind if you're trying to do something special for your significant other.