Building my first styrofoam cement background with some questions.

can anyone find a picture of what eggcrate looks like?
when i think of egg crate i think of the hard plastic boxes.
what kind of egg crate is used here?
 
ohh! yeah that's totally different from what i was thinking.

thank you for clearing that up!!
 
After 2 weeks since last post, I completed my first task - put the cement on styrofoam and color it. While I was doing that, I gain more experience. I even changed mix rate of cement and sand. There are lots of changes on rock texture. I found the one I made at the beginning doesn't look like natural. I put more and more concrete on it until I am satisfied with its look and feel.

Worry about I need to do a lots of water change, I decided put them in the sink and soak it first before I put them in my tank. I put them in black plastic bags and let them cure. I found it is good a way to cure cement becasue you can make it wet in the bag. Just like marinate chicken in plastic bag.

I will wait 15 days to put them in my fish tank.

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