I've heard of this slurry technique but have yet to try it.
Other than a few issues keeping a part bonded to the surface (or slight warp up) I have had much more success printing in ABS than PLA...and it's so much easier to remove support structures. I'm glad I spent the extra money for the 2x because it's so nice to have the option of printing with either.
Here's another source for filament
http://www.hobbypartz.com/3dprfi.html. Haven't ordered from them yet but the price seems right. I will try this the next time around. I've heard many stories that the cheaper stuff tends to vary in thickness which causes extrusion issues. Buyer beware as you try new sources.