3M MARINE 5200 ADHESIVE/ SEALANT High performance polyurethane adhesive/sealant becomes tack, free in 48 hours, and cures competely in 5-7 days. Retains its strength below & above the waterline. Stays flexible allowing for structural movement. Excellent resistance to weathering & salt water. Remains workable with trowel or spatula for up to 4 hours after application. WonÆt sag or flow in vertical or horizontal seams.