Neat trick...
Yessirday, I had the exhaust off the 109... I made that 20" extension pipe with rain-flippy. Well, the old muffler was still in good shape, but the aluminized finish was ugh-lee, and the extension pipe wasn't fantastic either... (it had some old paint on it).
So I started her up, and about the time the paint started blisterin' on that pipe, I took the 4.5" grinder with wire-wheel and stripped it all down good. Gave the muffler a light brushing too, but just to take off any stray crud... then let it cool.
Then I hung it on a wire (or 'whar', depending on how far south you live), and hosed it down really good with a can of cold-galvanizing compound.
Now, I've used this compound for antenna brackets, tower sections, and the walkway handrails for my boat dock, and it works really good for coming out of a rattle-can. After drying overnight, I figger'd on a 50-50 chance that it'd burn off at first fire-up.
And after starting it, running it for a while, then hooking on the blade and grading a 90' x 5' swath across the back of the lot, it's still lookin' like I just sprayed it on!
Grrrrreat Stuff!