I was polishing out the B pillar using a pad that was way beyond it's natural life, but I thought I could get, "just one more use out of it".
Nope. The pad separated and the backing plate hit the black plastic on the B pillar leaving some pretty ugly scratches and marring. Fortunately it was all very shallow and I was able to polish the marks out with a fresh pad.
This is in the early 2000. I had an Audi S4 5-cylinder turbo 1992 in dark blue. Spent a weekend with the popular here in Sweden at the time Sonax paint cleaner and Sonax liquid wax used by hand. It covered a lot of wash marring and looked great at the time. The next weekend I was going to wash it. Remember that I was a noob. I used my car soap and the gloss and covered swirls where all gone and back LOL. We have a car soap from Turtle Wax Superwash. You don't put in a wash bucket and at the you wet the car and applied the car soap in the sponge. The problem is that this car soap is a petroleum based one. You take away tar spots and sap with ease. I have thought to get it again as it's still available here believe it or not For before doing a polishing work. This I understod first 6 years ago when I got more serious into the detailing. And the cars got clean with this car soap for sure
Otherwise I have been lucky with miss happens so far. I ordered a 5L BH Surfex HD. When I got the package it was very light. The delivery had tossed the package into the semi-truck and the cap broke. Nothing was left in the 5L jugg. If you know how concentrated Surfex HD is. For paint I don't dilute it stronger than 1:20 and 1:10 on wheels in the summer 1:30-1:40 is more than enough. The trucker told the delivery store that it had made havoc in his semi-truck LOL. Right at him for being so uncarefull A lot of the other products where damaged. I got all of it replaced even if it where not so damaged that I still could use it. It where a lot of products LOL