The gaskets on my 560 were really bad, and porous. I don't think they are made of the same rubber that the rest of the weathersrtipping is made of and didn't seem to respond to rubber rejuvinating products well. I've seen the horror of what happens when these particular gaskets go bad, though - pervasive, cancerous rust - as expensive as new ones are (on my car, they are about $60 ea(!)), I'd replace them.