I got the grow cabinet cleaned out from the last grow and then sealed all the panels with silicon outside caulk, which I overlooked before getting the cabinet into operation for the last grow.
I also have a few yards of lightweight goretex backed nylon that I will use to line the top 12" of the rain science autoflower bags(they are 15" tall), it will still breath but be waterproof. I will also modify the "handles" on the bags so they do not pinch the bag closed and compress the soil when they need to be lifted out of the cabinet.