Homebrew PCBs

I have a question regarding the Piezo Heads in Epson printers. 
According to one of the links provided in the previous Inkjet 
threads, the Epson inks are solvent-based. Now I have read that 
solvent inks are non-water based inks. My question is if that can be 
construed as oil based inks? If so, I think I have found some cheap 
refillable inks that I will put into my Epson Ink cartridge and print 
out on some aluminium as Stefan has suggested. 

I feel that once we get the ink situated, a flatbed printer 
conversion would help make the pcb printing process complete becuase 
it would allow for component legends and double sided printing to 
occur flawlessly.