Yes, at the Goshen rally, the guy who sounded (and to a lesser extent, looked) just like Christopher Walken did say, emphatically, many times that it was not necessary to put anything on their rubber slide seal products. I personally use 303. His concern was not so much the slide seal flipping as it was that many people apply a product which will degrade or break down the material itself. 303 will not do that. Anything that makes it tacky or gooey is eating away at the material.