Bona R850 is an elastic one-component silane-based adhesive for parquet floors. It is water and solvent-free and causes practically no swelling of the wood. Firm texture – it retains the trowel pattern. Available in a 600ml ‘sausage’ pack, Bona R850T is a high viscosity adhesive made for gun application. Rapid setting, the hardened adhesive has a firm texture and can be used on nearly all sub floors.