Dear All! For those of you who would prefer to glue the rings to the cups or are having problems with the large rings, the following information will be of interest to you.
Ive been experimenting with glues and our foam sheets and rings and a glue that works well is called Evo-Stik multi-purpose instant contact. Its only about £2.99 for a fairly large can and it will stick either foam sheets together or you can stick the foam rings to the base of the large cup with it. It is important to use it like this:
1. Apply a generous even coat of glue to each surface being glued.
2. Wait for about 15 minutes for the glue to be dry to the touch or slightly tacky.
3. Line up the 2 surfaces and push together firmly. It will grab and stick instantly and you'll only get one attempt!
4. Allow 24 hours for it to set properly although you could use it before.
Tips:
The can of glue comes with a brush inside it and it is easy to apply.
It is important to wait until at least 15 minutes after applying the glue to each surface.
You could probably increase the height of the rings and depth of the cup by glueing the special foam sheets (available from me) to the base of your foam rings.
I hope this is helpful and i have uploaded a picture of the tin of glue (its a bit tacky i know) and also here is a link to ScrewFix which is a store in the UK where they sell it but it should be available everywhere;
http://www.screwfix.com/prods/38770/Sealants-Adhesives/Adhesives/Contact-Adhesives/Evo-Stik-Impact-Adhesive-250ml#YOU HAVE TO BE LOGGED IN TO VIEW THE PIC