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Just read that Gtechniq Crystal Serum has a hardness rating of 7-9 on the Mohs scale.
So he's either had your pants down and not applied it OR it's been applied wrong and failed.
I'd also say that just because the coating has been applied and the water is sheeting off, doesn't mean it's fully cured properly. Needs to be in a heated room iirc.
Black gold is normally hard as f**k too as with most Renault paints.
I bought one of the Laser pressure bleeders a few years ago for about £50-60 and it's been worth every penny.
Done my cars several times, my brother's megane loads and a few mates cars.