I've done a good bit of xerox and laser transfer so I am more than happy
to pass on my experience. Usually my transfer medium is a black and
white xerox onto a heavyweight smooth surface bristol. If you get into
anything with a big toot like cold press watercolor you are asking for
trouble!
Xylene is good - However; I have found Acetone is INCREDIBLE! Usually I
brush it onto the receiving surface liberally with dirt-cheap watercolor
brushes (or an official acetone brush avail. at most hobby stores for a
nickle, or a dime). Then I lay the xerox face down. I then either brush
on or POUR acetone onto the surface. WARNING: Never spread acetone
across areas 2+ square feet at one time! It can simultaneously combust!
(Did I mention make sureyou're well ventilated?)
Your copies need to be toner heavy. Any cool kid woring third shift at
Kinkos will usually be able to tell you which copier just got stuffed
with a fresh supply. :)
Have fun guys!
Reggie