The fixative in the hairspray gives the map a waterproof coating, and the ziplock bag further protects the map from moisture and abrasion. 1.
Waterproofing Paper: 7 Ways to Waterproof PaperClear Nail Polish. Coating origami with clear nail polish is, by far, the most economical waterproofing method for small pieces. Wax. Acrylic Sealer Spray. Polycrylic.