You should have no problem topping it with that. It'll help the Tough Coat last longer and IMO a nice carnauba gives the car a nicer finish.
Yes tough coat can be topped with a wax no problem. You can even put tough coat over auto finesse's tripple (which contains wax in it). I wouldn't go topping it over other waxes though, this combo alone is tried and tested to work by auto finesse themselves and I have tried this combo with excellent results. If you are sticking with auto finesse I would do one of the two following combo's since you have tough coat and illusion: AF Tough Prep ----> AF Tough Coat (2 coats) ----> AF Illusion or AF Tripple ----> AF Tough Coat (2 coats) ----> AF Illusion
Sweet, I have some paint correcting to complete first (FG400 megs M/F pad, SF4000) then I'll go with the Tough Coat - Illusion route. Now all I need is to order some Illusion Thanks for the help !!!!