The one thing I didn't do, but should be considered a MUST, after you take the gasket from the package it comes in, lay it out, in a WARM PLACE, for 24 hours, so all the wrinkles come out of the gasket. I just laid it on the floor, in the air conditioned room, and the wrinkles did not come out. I installed it anyway and had to tape the sealing part flat for a week or two before it would stay flat. I taped it with painter's tape and that worked pretty well but it would have been better if I had laid it flat on the floor in a WARM place.