I have just treated the car to the PermaSeal treatment found here:
Now, I don't believe for a minute that it will last 10 years, however I have used this stuff on my previous 2 cars and have found it good for at least 3 years.
I was offered the Supaguard Treatment for £250 when I bought my last Focus and the one before but knowing I could buy the kit myself for £10 I decided to do it myself. I found the Supaguard Treatment only lasted for 6 months on the paintwork but the wheel treatment and interior guard sprays worked much better. The PermaSeal is far superior in my mind. The only downside is you have to wax and buff the car twice, so is fairly time consuming.
I also sealed the wheels with some Autoglym Wheel Sealer. Never tried this stuff before so I hope it lasts a good while.