One-part adhesive sealant requires no mixing, typically cures within 48 hours so you can get back on the water faster. Extremely strong adhesive sealant retains strength above or below waterline.Ideal for sealing, bonding and attaching on the interiors of boats and RVs, or on exteriors below the waterline and where shielded from the sun. Tough polyurethane polymer resists weathering and salt water.Stays flexible, retaining strong bonds even during vibration, structural movement or shock.