I just had breakfast with a friend who sells chemicals, including various silicone based products. His company anticipates that one day silicones will be declared a risk because of bioaccumulation. That perspective would say that those of us carrying into the woods on our tarps, where it sloughs off and goes into the environment, will be polluting! He says there is no alternative to silicone.
He told me of one application that I did not know about... GasX! It's straight PDMS!