Sounds like you have an overlap liner (ie, no bead nor track to tuck it into). While I've never heard of doubling up a liner like that, I doubt it would lead to harm. However, a liner change is a good opportunity to 'refresh' the floor of the pool which, of course, would require the removal of the old liner![]()
I'll be following this thread to see if someone else has a concrete reason against doubling up the liners.
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