[SEL] How they do that?

[Richard Strobel]

  Howdy all;
The other day I noticed this very kewl antiquing job on this old cast iron 
radiator.  Have they just dabbed gold paint on the high spots or is there a 
better way of doing this?

On a smaller version, I'd like to cool the Universal Genset with this setup.

picture at;

http://community.webshots.com/photo/309986403/366476545gjJkmi

TIA
RickinMt.