Oil Vs. Propylene Glycol

The pros and cons of each:

As you’ll know from our studio manual, Glass Painting Techniques & Secrets from an English Stained Glass Studio (you can get a sample chapter here): once you’ve finished all the tracing, shading and highlighting you want to do with glass paint and water (and gum Arabic), then it’s often a good idea to carry on with glass paint mixed with oil (and no gum Arabic).

And then – you fire your glass just once.

OK, so the advantages of oil are … ?