This new spray from Rustoleum promises to make any surface impervious to water and other liquids. It is called a super hydrophobic coating, developed by Ross Nanotechnology and marketed by Rustoleum.
Check this LINK
for a demo and you will be impressed. I saw another demo that
included a smart phone which was sprayed, placed in a bowl of water,
and came out unharmed. A disclaimer says it is not intended for
electronic devices or clothing, but ads show its use on these items.
This is not late night infomercial, but a real product you can get
at Home Depot or Amazon (more stores coming soon). Oh, $19.95 for
the two step spray on process, which covers about 15 square feet.
Not a panacea as the ads portray and a coating does not last
forever, but a very good product. Am thinking back yard seat
cushions are a perfect application. Cool Stuff.