Hippo Pro 3 Sealant & Adhesive is a 3-in-1 sealant, adhesive and filler, which can be used straight from the tube without the need for additional fixings. Hippo Pro 3 has excellent initial grab strength with great sealant and gap filling properties. This sealant and adhesive sticks virtually any material, and is ideal for fixing mirrors, making external roof and gutter repairs, or sealing vertical expansion joints. It's also great for bonding difficult materials, such as specialised polymer systems, natural stones, metals, fibreglass and carbon fibre. Hippo Pro 3 Sealant & Adhesive can be used on damp or wet surfaces, and will even dry when applied underwater.