I will make my stand taller then, thanks for the pointer.
Look, I'm just going off of what he told me. I don't know what else to do as he has had customers have this issue. He is heavily advising me not to use foam as it is petroleum based???? I don't know. Is there anything else I can use?
He didn't tell me anything else, just regular plywood and said nothing about epoxy, but unsure what I would use epoxy on (then again I haven't looked into plumbing 100% yet so that might be used there...)
I don't know what to do
I want to listen to the manufacturer but I want to listen to you guys too 
Look, I'm just going off of what he told me. I don't know what else to do as he has had customers have this issue. He is heavily advising me not to use foam as it is petroleum based???? I don't know. Is there anything else I can use?
He didn't tell me anything else, just regular plywood and said nothing about epoxy, but unsure what I would use epoxy on (then again I haven't looked into plumbing 100% yet so that might be used there...)
I don't know what to do