Thin the viscosity of thickened fly-tying cement and keep it from hardening in the jar using Wapsi Thin-All Thinner. You'll want this fly-tying essential on hand to maintain the desired consistency needed for penetrating threads and creating tight bonds – a key to creating long-lasting flies. Featuring a low-toxicity formula, Wapsi Thin-All Thinner can be safely used as a universal option with similar fly-tying