@Sharon, you are right, wet cement probably won't adhere. I meant to say wait for the cement to start to harden and try to thicken it up with more cement. This may not work either, but I planned to give it a shot.
The dry and not-so-dry cement falls off the thin material very easily. So, I think it would take quite a bit of time to work this out. I will continue to use thick material. But I will wait a few days when I can maneuver on my feet a little better. And maybe a different stand idea will present itself. Every idea I've come up with will have to wait until pay day.
Tomorrow I get to go listen to the doctor remind me that I am not steady enough to be lifting heavy objects. Also, I have numbness and tingling in my hands and arms often enough that it is a safety issue whenever carrying anything heavy or made of glass I could drop. It was a very clumsy day for me and I pushed my luck carrying the cement block. I was having so much fun doing this project that I didn't have the patience to wait for the roommate's help. Then I felt more guilty afterward, because then he really had to help me a lot.
I am looking forward to the painting stage. And then when the planters are ready to put plants in them. The planter I made with terrycloth will probably be dry tomorrow! I can sit while painting it. But it is small, so I will probably just plant some herbs.