Everbuild Opti-Mix 3-in-1 Render Additive has been designed specifically for use with renders, giving additional waterproofing, plasticising and salt inhibiting capability. Controlled dosage for a consistent mix in an easy to use design with zero waste. 1 litre is equivalent to 25 litres of standard product. Tested to EN934-3 (2009) + A1 (2012).