Hello, So last weekend in the sunshine i finally cleared out the shed or playhouse as my wife calls it. We had not used it since we moved it and it looks like its sat idle for a few years. I wanted to ask what are the best ways to waterproof/fix the holes. The panels are solid but just with huge gaps (as can be seen in the pictures) and also there are plenty of other parts between the roof/walls with holes. I guess i can do that with waterproof bathroom filler but the large panels? Thank you!