K6 frame material

Been a bit clumbsy with the tools and have a made a light surface scratch on the frame of my 3 month old K6.

You can see the metal underneath.

Am I correct in thinking that it's not made of the usual Suzuki cheese but nice expensive aluminium which will form a protective layer on contact with air meaning that the damage is purely aesthetic?

[northwind]

Well... Pretty much any aluminium will, the surface oxidation is quite an effective sealant provided you don't clean it off. But I'd touch it up, myself, just a dab of touch-up pen would both seal it and make it look a bit nicer, if you do it well. Or Humbrol model paint I reckon it works better for simple colours than celly touch-ups do.

Ta