My company currently uses a tubular .75" neoprene door gasket to seal a heavy duty submersible enclosure. However, over the years (I'm seen some as few as 1) the gasket develops a groove left from the door edge. Because of the weight of the door when open, it hardly ever falls back into the depressed indentation causing the door not to seal properly. Is there a better material that will not leave a permenant groove?

Thanks for any help on this subject.