The hardest clearcoat I`ve polished is the C5 and C6 Corvettes. They call it "Ceramic Clearcoat".
Definitely hard as a rock. I`ve used M105/205 KBM with my PC XP and had pretty good success, but there are 2 factors that are mandatory:
1. Moderate to heavy pressure
2. Correction time is extensive / long, slow passes(takes twice as long as a "softer" clearcoat)
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