Here's what I did:
1. Purchased and had cut to size slate rock at a local gardening center.
2. Cleaned/disinfected the slate with dish soap then F10.
3. I assembled the cage (an AP T25 72" x 30" x 18" (L x W x H)) but left the glass doors and top of the cage off for better access.
4. I placed the slate into the cage and grouted it.
5. As per the instructions I let the grout cure for 48 hours.
6. I then used 2 coats of this stone/tile sealer: http://www2.dupont.com/Stone_Tech_Pr...of_sealer.html (link includes instructions for application and safety information)
7. I let the cage air out without the doors or cage top on for 2 weeks.
8. I finished assembling the cage (put the cage top/lights in) and started to get my temperatures set up.
All in all it took about 3.5 weeks to complete. In the near future I'm going to be making a collection update thread so I'll try to remember to get some good pictures of the cage then.