Hi Dances!

In some cases you can have the acrylic fired off of the piece and then use a glaze that will be fired again to create the shiny look you want. For the life of me I can't remember the products name. I just got off the road from a long car trip and I am bushed. I will look in my box of goodies and let you know tomorrow.
If there is a ceramic shop nearby you can take your pieces in and have them evaluate it for you.
More later
Sherry

Dances- how about a varnish- either spray or in a can? If you use a can, apply light coats with a good brush so it looks nice & smooth.
Another idea is the 2 step crackle medium kits. You paint one coat, then go over it with a second layer of something else and it makes very fine even cracks just like old porcelain. You rub a dark paint into the cracks and they show up very nicely. It might look cool, depending on what your figures are.

Karen