Everbuild Opti-Mix Super Concentrate Integral Waterproofer - 1L Everbuild Opti-Mix is a highly concentrated cement and sand admixture that aids air entraining and waterproofs. Opti-Mix vastly improves mortar workability as it creates very stable air bubbles in sand/cement. Once Opti-Mix applied to render it gives a butter like consistency and prevents shrinkage, cracking and mild frost damage. Water absorption is greatly reduced due to extreme pore blocking abilities of the Opti-Mix. Everbuild Opti-Mix prevents salt formation. Main areas of use include: pool and tanks lining external render and pointings various structures below ground level. For more info about the product, application advise and limitations please see technical data sheet below: Everbuild Opti-Mix Super Concentrate Integral Waterproofer