OPTI-REND 3 IN 1 RENDER ADDITIVE 1LTR - OPTIREND1 OPTI-REND is a plasticiser, waterproofing agent and salt inhibitor designed specifically for use with renders. - Waterproofs, plasticises and retards - Controlled dosage - Consistent mix design - Easy to use - No waste - 1 litre is equivalent to 25 litres of standard product - 250ml is equivalent to 6.25 litres of standard product