Soldato
It says in the instructions not to remove it. I fit at least half a dozen sets of pagid discs a week and have never ever has any issue with the coating.
I've never bothered to read the instructions.
It'll get removed by the pads anyway so it seems sensible to clean it off, especially as previously I've fitted their painted blanks discs and had shoddy noisy braking for a few stops (Howard may remember this from my 328) and when I popped the pads off a short while later they had paint crap in the friction material.
I'll stick with my method, done it for years and they work well without any detrimental effects to braking or anything.
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