I've just placed a fresh order for waterproof paper for the Dorset 100 route description, having seen Robert Barclay's RD survive the prolonged soaking on the Valleys 100 two years ago. Lightweight and convenient, it worked for me on the Red Rose but of course, didn't get fully tested. It was certainly much better and less fuss than laminating 20 sheets of RD. BUT... it's important to know whether you have a laser or inkjet printer. I bought laser and did a test print of just a couple of sheets on what turned out to be an inkjet printer, and the lettering pretty much rubbed off.

The product is Memory Map Toughprint Paper and I've just paid £15 for 25 sheets direct from the Memory Map website.