What type for mortar does one buy to set a plastic tub into to make it a bit more solid underfoot? This would be on top of a plywood subfloor.

Thanks?

What type fo mortar does one buy to set a plastic tub into to make it a bit more solid underfoot? This would be on top of a plywood subfloor.

Thanks?
... thinset (for laying ceramic tile), but make certain the plastic tub is not sensitive to the ingredients in the mortar.

What type fo mortar does one buy to set a plastic tub into to make it a bit more solid underfoot? This would be on top of a plywood subfloor.

Thanks?

We just use regular cement and set the tub on it and leave it alone until it sets up. Tom