After this I added the bag and treated it thoroughly with the plumber’s helper. It was much easier than I thought: it felted just great, it didn’t take too long (appr. half an hour), and it was not too exhausting. ###>After this I added the bag and treated it thoroughly with the plumber’s helper. It was much easier than I thought: it felted just great, it didn’t take too long (appr. half an hour), and it was not too exhausting.