Linda,
I wanted to add this information last night but ran out of time. The owner of
www.dakotapastels.com, shows his pastels without glazing. You might want to talk to him.
I did not mean to scare you about the plastics, but strangely enough not all of them are compatible. The glues sometime have to melt the plastic so it will adhere. The best person to talk to is your local plastic fabricator. You can find them in the Yellow Pages. It really is not as easy as it seems as I found out.
The technical staff at Alusuisse is very helpful.
Sincerely,