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In my opinion the damage diesn't appear to be the result of a liquid chemcal damage from the exterior as the marks would most likely show pooling marks of a liquid. I have seen this once before many years ago on a Ford and was attributed to acid etching through from the metal below. Prior to painting the car body is dipped in an etching bath to remove contaminants and then washed clean of any acids and alkilis. Any remaining acid or alkili can force its way through the primer as it is porous and in turn force the paint to break away. If you knew which company supplies the paint for Renault during manufacture you may be able to contact their technical department for advice.
Currently in madnoel10's garage:
Honda Civic 1.4l