Apparently one can secure a mac by issuing the command `sudo pmset -a destroyfvkeyonstandby 1` which tells it to destroy the FileVault keys on standby, whether standby to memory or disk.
RejeX is a thin-film polymer coating designed to provide a high-release surface. Can be used to treat motorcycle shields to repel water and make bug removal easy. $15 a bottle. Perhaps worth checking out if Raincoat doesn't work out.
Moto Solutions make 2 products, Fogtech and Raincoat and anti-fog and a rain protection product for plastics including motorcycle shields. Looks excellent.