Using grey Portland cement for fake rocks ?

[marinerules]

I know people have used this and it has to cure. I have clear sealing epoxy from polygem. If I coat my completed rock with the cement with a couple layers of the sealer I shouldn't have to wait for the cure right ?


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[deeda]

I'm not sure. Cement cures by an exothermic reaction and I think full cure is achieved in 30 days so you may have to wait at least this long.

 

[krichardson]

I've been toying with the idea of using concrete to make rocks to surround my pond.I'm guessing you are considering placing the rocks in your tank?

 

[marinerules]

Yea I've do e it before.

This time I have this sealing clear coat epoxy

I have cut a 6 inch pvc half way through about 20 inches long , stuck it in the oven and flattened the PVC sheet out. I then took a jigsaw and cut out a lettuce coral pattern and stuck the PVC back in the oven to make several curves and 3d look

I have one side covered in fast curing cement. I have also stamped the concrete with the texture of a real coral

I'm gonna see how this turns out


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[captainahab]

I think the epoxy will adhere better if the concrete is 90% cured and the rule of thumb for that is 30 days.