See my post on this topic.
I have several other posts on this topic if you search for "clear bra".
I've had the clear bra installed for about 4months. There's a couple of tiny nicks where its been hit by road crap. They are barely visible. Can't be rubbed out or anything. Maybe the paint could have been rubbed out or maybe it couldn't.
The clear bra kit installed on the front bumper does not wrap around the very bottom. This is kinda stupid since that's where a couple of other nicks in the bumpper are.
I had the car sealed with Permaplate products (Paint Guard) after installing the clear bra. It's a non-carnuba sealer. It doesn't do a thing to protect the paint from scratches or road crap. It looks good and the Permaplate warranty applies to the clear bra. Paint Guard is reapplied every 3 to 6 months.
The bottom line is that the clear bra does what its supposed to do. The minimum application would be to do the front of the car. Additionally, the top of the rear bumper, splash guards, door cups and mirrors. And then, anything else you can afford (whole hood, rear bumper, rocker panels, etc).
Paint sealant is probably not worth it. Read the Wash and detail Forum for user's experience with different wax products (Zaino seems to be a favorite as is Meguiars) that will keep your ride looking good and your paint in execellent condition. Also buy some microfiber towels and applicators.
Also, the most important thing in making it easy to keep your ride clean is to use soft water when washing it. This will eliminate most water spots and reduce your time spent. Some members have tried the new Mr. Clean product and reported excellent results.