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Depending on how long it will be before the new liner arrives, I'd do as much as possible without defeating the rework.
If you retrowel the floor and leave it uncovered for a week of thunderstorms, you've wasted your time. Please let me know your schedule on liner arrival and placement and I'll try to give you a workable list of things you can work on, prior to receiving and installing the liner.
Knowing your location would help so I can see if you're expecting storms.
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