To be honest, I didn't know about damaging the clay, but I only used a fairly small piece and new it was going to be sacrificial and thrown away afterwards anyway.
Fall out is all the ferrite contaminants that attach themselves to the paintwork (much more noticeable on a white car as what looks like little orange rust spots), and comes from railway sidings and the docks etc. as the car is transported or stored dockside. If left, it can etch into the clearcoat.
Total time from start to finish I guess was about 8 hours (over 2 days).
Bookmarks