For those curious about the composition of the hydrophobic coating, the FDA and USDA guidance docs talk about the constituents: http://www.spillcontainment.com

For those curious about the composition of the hydrophobic coating, the FDA and USDA guidance docs talk about the constituents: http://www.spillcontainment.com/sites/default/files/FDA%20and%20USDA%20approvals%2010-1-12.pdf http://www.spillcontainment.com/sites/default/files/FDA%20an... It looks like it is fumed silica in carrier solvent with polyurethane adhesive. The fumed silica is branded "Aerosil", and made by Evonik: https://www.aerosil.com/product/aerosil/en/products/hydrophobic-fumed-silica/pages/default.aspx https://www.aerosil.com/product/aerosil/en/products/hydropho... Interestingly, it looks like Avon has a patent that covers applying hydrophobic Aerosil to keratin fibers (hair): http://www.google.com/patents/EP2293760A1?cl=en&dq=evonik+hydrophobic&hl=en&sa=X&ei=9T0WUbzZKZHviQLr3ICADQ&ved=0CDMQ6AEwADgU http://www.google.com/patents/EP2293760A1?cl=en&dq=evoni...