For sealing snow guards on a cold day
SB-1800 Surebond Everflex Bondaprene Cold Weather Adhesive Caulk
This material from Surebond is Everflex Bondaprene, a clear cold weather adhesive caulk. SB-1800 can be applied at temperatures as low as -20F, and will provide up to 500-PSI tensile shear strength after curing in 24 hours. Available in 10.3 oz tubes with 24 tubes per case.