Hi, I have to admit that UDS isnt the easiest to get off, put it on very thinly and never do it in bright sunlight, its one of those weird ones that you have to use on a cloudy day and risk the rain (ironic I know).... Autoglym isnt the easiest to work with but it can give good results, try the Super Resin Polish and extra gloss protection afterwards instead, then maybe a carnauba wax afterwards (doesnt have to be Autoglym). The Extra Gloss Protection is a sealant rather than just a wax.
On another note, have you clay barred the car first? This will get rid of anything on the paint that a standard wash and polish won't, what detailers call "industrial fallout".....This stuff, which you cant see but you can feel, is what makes the paint feel rough, and more importantly would have made the UDS stick when you try and rub it off.
If you have time (and havent done so before) get a claybar kit and give the car a good going over with it, you will notice the difference in a big way!