q panel by spray application coat thickness about 40 50 u03bcm after spraying the metal sheets are dried for 24 h at room temperature and then for 2 h in a drying oven at 70 u00b0 c the metal sheets are abraded with a quartz water slurry 100 g water 1 g marlon a 350 0 25 5 g sikron f500 using an abrasion and washing resistance tester erichsen brush with hog 39 s bristles the gloss before and 10 min after the abrading is determined with a reflectometer 20 u00b0 irradiation angle the silicas 1 2 and 3 4 according to the invention can be used in high concentrations without impairing the appearance of the lacquer surface owing to their substantially lower rheological efficiency compared with comparative silicas 1 and 2 in addition the silicas according to the invention display a substantial improvement in the scratch resistance of the lacquer surface in this example the influence of the structural modification was investigated on the basis of a high solids 2 component pu clear lacquer the formulation of the lacquer and its production including application and testing are summarised below the binder is mixed with the solvents then for the purpose.