7 litres of SBR per 25kg bag of cement to give a totally waterproof render. Polymer emulsions of this type have been used ex-tensively over the last 20 years by the building in-dustry as an admixture for cement and concrete ap-plications, including repair and renovation, surfacing of floors … The mixing was continued for 30 min at 1130 rpm. Render over it when wet as it'll help the render stick to the wall. forget the PVA, completely ,use SBR as per the makers instructions, and use tile primers where recommended by adhesive maker recommendations and in the correct dilutions … Assuming its a chimeny brest that's a couple of meters wide and 2.5 to 3m high, you should have plenty of time to render it in 15 mins. I know Wickes sell it in 1lt size - not sure … Free fall mixers are not suitable for SBR mortars; the higher performance forced action paddle type mixers are recommended for more efficient and speedier mixing of the mortars. SBR is a versatile product and it would be practically impossible to provide a comprehensive list of all its potential uses in the paving trade, but here are some of those more commonly encountered: As a strengthening agent for concrete surfaces Do not use neat SBR as a bonding grout, without adding cement. The amount of SBR required will depend on the bond strength needed. Coverage: BAL Bond SBR is suitable for dry or wet applications, and interior and exterior locations. uses as an admixture, primer, bonding agent and seal-er. SBR is essential to your work when using certain stone products. May be applied directly with a brush as a primer, sealer or dust-proofer • Priming the top, back face and edges of plywood: Apply undiluted SBR UNIVERSAL BONDING AGENT • For priming porous concrete and cement: sand screeds dilute 1 part SBR UNIVERSAL BONDNIG AGENT with 4 parts of water by volume The binder SBR (Zeon) was stirred in at the end for 10 min at a low speed of 200 rpm. After dry mixing, a premixed 2 wt% CMC (Sunrose, Nippon paper industries) solution was added together with water to adjust the desired dilution of 2.5 wt% in the formulation. Priming a surface before you level or tile it will improve the physical properties of mortars. You can use any brand of SBR Primer, follow instructions on container as this has numerous uses and dilution rates vary for each application Most places only have SBR in 5ltr which will be way too much. You'll notice improvements in your mortar's adhesion, durability, flexibility, waterproofing and workability. Remember to always seek further advice/guidance from board manufacturers. Why you should Use SBR on Patios and Paving. Personally I'd roll SBR/water over it, around 1:4 it's the "new PVA" It does everything better than PVA IME. Generally, 5 litres of SBR per 25kg bag of cement in an external render for an area of normal exposure. Yes, you've understood the instructions correctly. 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