Practical Sailor's gear and boat reviews take the guesswork out of your buying decisions.

Volume 31
Number 5
March 2005

Map Seal

A safe, economical way to preserve charts and other documents on board without much fuss.

Last year, when Practical Sailor tested about a dozen spray products for rendering woven fabrics water-repellent (see PS June 2004, "Water Repellents for Fabric"), a sample of Map Seal® was submitted. Unlike the fabric sprays, which are supposed to let the material "breathe," Map Seal dries as a solid film that is meant to waterproof paper. It is described by its maker, Trondak, Inc., as a polymer coating that protects from water damage topographical maps, nautical charts, lab documents, recipe cards—essentially anything made of paper.…

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