I would check with TM to see what they think. I'm wondering how fast the foam drys??
I had a hot tube that the bottom was was fill with spray in foam. When we went to move it, it was fill with water and we could not move it. It took for ever for the foam to dry out when we covered it and no water was in the unit. It was not completely dried after letting it sit from early spring to mid fall with the tarp over it. But we could move it. Something to do with the foam trapping the water and acting like a vapor barrier and not wanting to release the water.
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