[sdiy] Coating aluminum

[David G. Dixon]

Well, I've just put DecalProFX dry transfer decals on some bare aluminum
panels (it was a fairly frustrating experience, but I've just about got the
hang of it now), and I'm looking for something to coat the panels with to
make the printing durable.  I've tried Krylon Matte Finish clearcoat, but I
can scratch it off easily with my fingernail.  I'd like to use some kind of
clear lacquer (preferably acrylic), and I'm not looking to have to do a
whole lot of surface preparation.

Any tips?