Seasons on the Fly UV Curable Fly-Fishing Adhesive is field tested by the staff of Seasons on the Fly for use on all types of fly tying. This is an excellent adhesive for bonding most natural and synthetic materials. The adhesive will not cure until exposed to UV light or direct sunlight, and it does not soften or whiten when exposed to water.This thinformula is ideal for wicking into materials for a light layer of adhesive. Made in USA. Sizes: 10 grams, 20 grams. Color: Clear. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.