If you are experienced enough in maskmaking to give a workshop, one might think that you would know that they take time to make.  The only quick alternative I know would be to use pre-formed plastic masks and decorate them, like you would for kids.

I regularly sculpt and paint papier mache projects in a day, or less, so, it can be done.

If you're in a hurry, the application of heat can be used to dry papier mache quickly.  I've used candle flames, woodburners, and oil stoves to do that, but my figures are generally small to begin with, so it doesn't take much to dry them out.  I should also add that I don't use any water in my papier mache, just undiluted glue, so they're not very soggy to begin with.  And, of course, I must warn you that paper is highly flammable, so using a strong heat source or open flames to dry it is not something to do without due care and constant supervision.

That's correct, my papier mache sculptures are usually solid, rather than hollow constructs.  I agree that warpage of thin papier mache objects is often an issue as they dry (or even after they're dry when you paint them).  I imagine that if one had a form to place it upon while heating it, like a mannequin head, that warpage could be minimalized in the case of a mask.

Years ago, I can recall making a skull mask out of paper pulp for a college course, and, frustrated that it was taking too long to dry, I attempted to bake it in a gas oven, and it promptly went and fell apart on me.  Much profanity ensued, and I ended up having to redo it with newsprint strips instead.  However, as the project required the use of paper pulp, I ended up "cheating" by applying  a thin veneer of pulp on top of the strips to satisfy the parameters of the assignment.

I also conduct 2 hour workshop in making paper mache maks in the Mexican Tradition.  I know that 2 hours is not really long enough for the paper mache forms to dry.  I set up other workshops later in the month or even year for art attendees who want further instruction in painting and more detailed forms.

I have to admit, dryers and other materials that I have used to make the process a bit faster have changed and even warped the forms! I will try the plaster of Paris mix for one of the classes to see what happens.

Frankly, I am starting to think, the only solution is the hot Californian Sun!

Diego Marcial Rios

Take Care and God Bless you all!  Viva Arte!