Sika SikaBond Exterior Grade Waterproof PVA Ultra, 5 Litre

Excellent stuff, used it on the front of my house between the bay windows where its pebbled concrete. Water just runs off now rather than soaking in and it also helps glue the cement.
Sika SikaBond Exterior Grade Waterproof PVA Ultra, 5 Litre
Suitable For Internal And External Use Multipurpose Easy To Use D3 Bonding Agent
Waterproof PVA for interior and exterior use as an adhesive and sealer.
SikaBond Waterproof PVA Ultra is a waterproof vinyl acetate polymer especially formulated for exterior use as an adhesive and sealer. Suitable for brickwork, mortar, render, screed and plaster. It is easy to use and unlike normal PVA it will not re-emulsify when wet.
Waterproof formula.
Will not re-emulsify when wet.
Toughens screeds and mortars.