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Primers & Additives



Koster FS Primer is a fast curing, transparent, solvent-based single component bonding agent and strengthener for the flanks of joints. It is used as primer for the subsequent application of KOSTER Joint Sealant FS-H and FS-V. The material is humidity cured. It binds the dust and is resistant to saponification. Its low viscosity enables it to penetrate a few millimeters deep into the substrate therefore stabilizing and strengthening the substrate.



Koster VAP 1 06 Primer is a water based one component resin system for priming absorbent and non-absorbent substrates such as KOSTER VAP I moisture mitigation systems, terrazzo, marble, metal decking, ceramic, and quarry tile prior to the installation of the cementitious products. Follow each manufacturer’s product data sheets for suitability.



Koster SB Bonding Emulsion is a universally usable synthetic liquid for all cementitious mortars, plasters, and sealing slurries. KOSTER SB Bonding Emulsion is solvent, plasticizer and filler-free. When added to mineral systems, the synthetic liquid increases elasticity and flexibility, and reduces water absorption. It is designed to be used as an additive for KOSTER NB 1 Grey. The material imparts excellent improved protection from water soluble salts, acids and alkalis.