By all means pop by but I'm not in everyday at the moment due to nearing the end of my pregnancy so it might be worth dropping me a pm before hand.
I am returning to detailing work around end of March/early April which is a good time after winter to get the motors looking shiny again :)
Sorry that I'd not come across this thread sooner, but looks like you've managed to get most of it sorted out.
The black magic will basically mask with fillers any remaining issues with the bonnet/bumper therefore this will be a temporary fix. I would suggest that once the weather improves...
I wouldn't recommend continual use of neat Bilberry as it can affect the paint on the calipers.
I generally use a dilution rate of 4:1.
It is good to fully clean, decontaminate and then seal the alloys as it does make maintenance cleaning much easier and faster
It won't remove your existing protection by using more than recommended so there is no need to be concerned.
All the shampoos we stock are highly concentrated some more than others and I generally use 1 to 2 capfuls in our buckets we stock (20 litres).
Hhhmmmm.....well for one there guarantee isnt worth anything as they are saying you need to use their shampoo on a regular basis afterwards, therefore how can you prove you have or havent used it so I don't think that is worth the paper its written on, ie its their get out clause.