I'm not sure we can comment before we find out what it is that Alf is actually taking about here, Mike.
Some sort of magic spray-on product, perhaps ... a lacquer? Or could it just be WD-40?
Either way, can a "maintenance spray" really be regarded as a "modification"? Are disinfecting "wipes" and other such "products" often applied with gay abandon by users so considered?
OK, we know that some of the more "aggressive" applications have been known to degrade plastic casings ... but if owners wish to abuse their equipment like that (or, indeed, in a multitude of other ways), surely that is up to them, and not really the concern of the OEM. The OEM shall no doubt be happy to sell replacement equipment, after all.