I used purple glue sticks when I did mine, they work great.
I made coasters once, too. A bunch of them. I used those glass picture coasters and made inserts that were covered with cigar bands. They turned out awesome.
The only problem I could see is that the coasters had a slot in the side where you put the picture or whatever in them. If a sweaty glass or bottle was on the coaster, the water would run right inside and ruin the picture or whatever was inside.
So once I slid in the card with the bands glued on them, I sealed the seam that ran all around the edge of the coaster. I used 100% silicone, was very careful, and cleaned any excess off with a razor. I cleaned the whole deal with alcohol a couple times before I applied the silicone, too.
I can't find the pics of them, either.
