Thompson's Water Seal
- Technically speaking, it works. I've used it on US Forest Service printed
7.5 minute topos. It wrinkles them badly and the fumes are both noxious and
long-lived. Just reading them after treatment is sufficient for an Excedrin
headache #3. I have a tough time imagining anyone making a regular habit of
using it for anything other than waterproofing wood or getting a "head rush"
off the fumes although Thompson's has been recommended in at least two
outdoors magazines for map treatment.
Between hiking, kayaking and SAR training, I go through a lot of maps. I use
the REI-brand waterproofing if I want to chemically treat a map. I primarily
use the "Duck Tape" brand rolls of laminating paper (sold in the shelving
paper @ Wally World) as well as gallon- and two-gallon sized zip lock bags.
Thompson's would be my method of absolute last resort.
Mystic Order of the Sleepy Knights of the Hammock,
NW Georgia Temple