OptiGrund E.L.F. SilaCryl-based, highly penetrating, special primer for exterior and interior surfaces; verifiable through a special black light-reflecting finish. Product Description Field of Application Primer to equalize rough, porous, absorbent or slightly sanding renders/plasters and concrete surfaces and interior gypsum building and plasterboards before applying emuslion-, silicone resin- or polymer resin paints. For exterior and interior use. OptiGrund E.L.F. may also be used in rooms without explosion-proof fittings or in insufficiently ventilated areas, as well as in rooms used for processing or storing foods and luxury foodstuffs. Due to the special SilaCryl technology (extremely fine particles) the material is deeply penetrating and enhances hydrophobic properties. In conjunction with a black light lamp, the special UV indicator provides verification of priming even after a following coat. To do this, the coating is carefully scraped away down to the substrate and illuminated with an ultraviolet lamp. OptiGrund E.L.F. is then characterised by a bluish/purple reflection. Material Properties Material Base / Vehicle Packaging/Package Size Low odour. Emission-minimised. Solvent-free. Enhances hydrophobic properties. Ready-to-use. Easy to apply. Silicone modified, aqueous acrylic resin hydrosol. 1 l, 5 l and 10 l Keep in a cool, but frost-free place. Technical Data Application Suitable Substrates Substrate Preparation Surface Coating System The substrates must be sound, dry, clean, and free from all materials that may prevent good adhesion. In Germany: Follow VOB, part C, DIN 18 363, paragraph 3. See Technical Information No. 650 for suitability of OptiGrund E.L.F. on different substrates and their special pre-treatment. Apply one coat of undiluted material on substrates with normal absorbency. On highly absorbent surfaces apply one coat undiluted, but soak thoroughly. The priming coat must not form a continuous, glossy film, but due to the special UV indicator a slight surface lustre will appear.

Technical Information No. 660 Consumption Application Conditions Drying/Drying Time Tools Approx. 150–200 ml/m² depending on the substrate absorbency. The exact rate of consumption is best established by trial application. Minimum Temperature for Application and Drying: +5 °C for material, substrate and ambient air. At +20 °C and 65% relative humidity recoatable after approx. 12 hours. Lower temperatures extend the drying times. OptiGrund E.L.F. may be applied by brush, roller or spraying equipment. Airless application: Spray angle: 60° Nozzle size: 0.029" Pressure: 50 bar Clean tools immediately...