<<Permanent markers definitely work. I would think the acrylic would work
also.
If you want a commercial product, try Gallery Glass. May I ask about the
project you have in mind? The Gallery Glass paint may not work depending on
the project because it is thick, but transparent!>>
I'm still scheming about the whole Art Nouveau theme and I'm looking for
some inexpensive (and safe) alternatives to creating a stained glass look.
Some of my students will probably use real glass, too, but I realized that
the acetate might give them some practice materials to work with! :-)
I'm going to have them do pen and ink work, too (ala Beardsley) and they
might be able to do kind of a nifty layering thing using sharpies on
acetate. I'm brainstorming like crazy these days!