I have one of these from Mark and it still leaves spots on my car so still have to dry it down with a towel.
Leaves horrible tide marks on the 458 front aero wings as it is a concave shape so a small puddle collects there. So if I forget to soak up the water a nice mineral ring remains.
Don’t have a particle reader so don’t know how well it is working or ever worked. Only had it 2 years I think and it’s not used that often so the resin should still be good.
Just my experience.
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