I attached the uth to glass first. (one is attached to a piece of glass used to put under a potted plant and the other is on a glass from a picture fram. I put the rubber feet on the bottom and slid them into place under the tank. I don't think it would have been a problem to just stick them onto the wood, since the wood can take the heat very well, I just liked being able to easily move them to adjust the gradients and to make replacement simple. I wouldn't pour wet plaster over them directly, but you could probably make some sort of protective sleeve or case first and then go ahead and use the plaster on top of that. You would need to consider leaving air space around it somehow to allow for expansion and heat build-up.

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