I don't know it anyone has done this but I'm also a Chalice lover and needed some frag disks for them to grow on. I got some AquaForest, not a vendor, Stone Fix. It's a type of cement for saltwater aquariums aquascaping. A light bulb went off, seldom happens, and I started a little experiment. I got a small Glad food container and tried mixing the Stone Fix in it. After a few tries I figured out the right amount for a solid disk that wouldn't breakup. So here is what I did if anyone is in the same boat.
1. Mix and cup.
2. For the thickness I wanted @ 3/4", 7 teaspoons of mix.
3. @ 5 teaspoons of water. Shake it for a few minutes to work the bubbles out.
4. Let it sit until it becomes solid but soft enough to ream out space for a frag plug.
5. Let it sit over night to cure.
6. I put the disk in some saltwater to make sure it will not crumble.
Now there is a disk that your Chalice or other will love
1. Mix and cup.
2. For the thickness I wanted @ 3/4", 7 teaspoons of mix.
3. @ 5 teaspoons of water. Shake it for a few minutes to work the bubbles out.
4. Let it sit until it becomes solid but soft enough to ream out space for a frag plug.
5. Let it sit over night to cure.
6. I put the disk in some saltwater to make sure it will not crumble.
Now there is a disk that your Chalice or other will love