Why does delay of sanding time occur and how is it eliminated?
unsuitability of applied primer paint and filling varnish for sanding within the period stated by the manufacturing company or according to the time expected by the consumer. Reason: Mixing ratio stated by the manufacturing company is not obeyed for two component paints; ambient temperature is very low; wood or ambient is very moist; a very thick application is carried out; above all, product or system is not well known in terms of suitability for sanding.
Solution: Before application, mixing ratios should be performed properly, application should not be performed at excessive moisture and cold and application should not be very thick. Regarding the selection of system and brand, since drying time is long as curing occurs with chemical reaction at Polyurethane and Acrylic systems, it should be also noticed that these systems become suitable for sanding late, sanding time is 6-8 hours at the summer, 24-72 hours at the winter and the ones which get dry earlier than those times which are normal by chemical structure probably contain modified resin. However the time needed by original Polyurethane or Acrylic varnish or paint to become suitable for sanding may be shortened by heating.