Any Supaguard type product is only as good as the person who applies it. It sounds like somebody with little experience or a careless attitude applied yours.

Suggest you insist they take it back to how it was before - this might involve electric buffing with a fine compound.

Put your concerns in writing to the top person at this dealer and clearly state what remedial action you are seeking.

I've bought 2 new fords from different dealerships in the London area in the past couple of months.They both were promoting "Diamondbrite" for applying to both cars.Similar stuff to Supaguard. Each asking £400 to apply inside and out. Something that's plugged by the sales people because of commission.( along with GAP insurance and finance).

I wriggled out of it and paid under £100 for a full kit from the Diamondbrite website. At least I can do it myself and do it properly. There are enough ***tube videos and internet sites to guide you through applying the process. Just waiting for this bleeding rain to pause long enough!