Thank you so much guys!!
Muzfish4,
I used this product...I thinit down with a little water after thoroughly mixing it as it is THICK with real metal shavings...
I thin it down so i can have more control when I paint it onto the surface to be rusted...once it dries, paint the activator over it...
after about 20-30 minutes, it will begin to turn into "rust"...you can let it go for a few hours, or seal it with a clear matte coat when
it turns to your desired effect...

You can find this stuff at Michael's, Joanne's or probably most any good craft store...they have many different colorings as well...you can also google it.
Cheers,
Carl