Homebrew PCBs

Has anybody tried printing a solder mask onto their boards?

I currently used pcb-fab-in-a-box with the GBC laminator and I can get 6mil traces and perfect boards every single time. 

I have been looking for a supplier in canada for dry film solder resist and found nobody, only this company in germany:

http://www.octamex.de/shop/?page=shop/flypage&product_id=31&category_id=5848924494118370762daa6f026e22f7&

and this guy using it:

http://www.gerold-online.de/cms/en/uc-projects/soldermask.html

My question is could you print on a flatbed modified printer 4 or 5 layers of color to build up an effective solder mask?

Thanks!