I want to try painting glass to look like stained glass. A book I have recommends "pooling the
paint" between extruded outlines, so the paint dries uniformly. I'd like to try this technique without having to switch to solvent-based glass paints. I'm thinking of experimenting with a mixture of GAC 200 and 800, assuming you think long-term adhesion would not be an issue.
Method of application can vary. One method would be to pour, like you mention. You would have to blend the GAC 200 and 800 in such a way that they have the best of both worlds, non crazing AND hardness. We'd start at a 1:1 mix. If you could get this to work, this would be a great base mix for the paints. The key is to not allow the pours to be too deep. Use something like our Graphite Gray or Iridescent Silver as the leading. Put it into cake decorating bags and even use their tips, or just cut an even hole in a plastic bag. After the outline leading dries (by the way, you can tape the outline image on the other side of the glass to use as a reference), then do the pours of color. Keep the thickness to as thin as possible but with the coverage you need. Most colors will work, but the Quinacridones and Phthalos are great transparent colors. Amount of color needed will vary, but start at 20:1. Once you do a pour and it begins to dry, DO NOT MOVE IT, or you will have surface defects! Let it sit for 2 days unless you know it's dry.

Another thing you may wish to try, and incidentally is how we plan on going about this for an upcoming project, is to first come up with the design for the outline and what colors we want where. Then, instead of going directly on the glass, our plan is to apply thicker paints to plastic sheeting. The polyethylene plastic is the thick kind you get in rolls at hardware stores. Tape down the plastic onto a flat table, and evenly smear color/gel over it. Let these layers dry and you can cut the paint and plastic into the shapes with an Xacto knife. Then you simply peel off the plastic and stick it to the glass. It works really well, and you can undo it at any time.