some one will no doubt tell me I'm wrong on this but it dosnt matter about wether the license is waterproof/hard wearing or what ever
no need to even take it outwith you, as long as youve got one and you record the number(mines in my phone)you'll be ok
on the extremely rare ocasion you will ever get asked to produce it, all you need is the number, the chap will phone in to the office to get it checked and away you go