This masonry paint has a unique 'Alkali Guard Technology' containing a built-in primer. This shields against damaging alkali salt attacks from render or wall construction, giving you a problem-free exterior which will look better for a longer time.Guaranteed for 15 years and for use on brick, concrete, pebble-dash and render.Weathershield Promise: if your walls peel, flake, or there is mould growth within the paint film while you live in your home, we'll return the value of a replacement product. Simply register on our website with your receipt and before and after photos within six months of purchase. See Weathershieldpromise.dulux.co.uk for full T&Cs.