Ye I'm grand Roy cheers I'm still poncing it about in the mini lol
As for the topic
Don't forget the autoglym stuff is just a dressing it sits on the plastic and it there for effected by water/grime etc
The C4 is a chemically bonded treatment that basically becomes kinda part of the plastic and is thus much much more durable doesn't get water marks etc and doesn't need reapplying after every good wash, I was very sceptical about it and have tried many a trim dressing inc all the autoglym stuff/megs/chemical guys and for long term and finish it blows them away IMO