PU lacquers should not be applied and dried at material and room-temperatures below 18 °C and 40 % RH. Ideal values are: 20 – 25 °C, 50 – 65 % RH. Deviations will result in drying or hardening errors. In order to avoid adhesion problems, please sand the PU lacquered surfaces before applying fresh lacquer and apply lacquer to the sanded surfaces as soon as possible. Old lacquer and hardener mixtures affect the surface quality (adhesion/resistance). Freshly bleached substrates must undergo intermediate drying for at least 48 h at 20 °C before coating with suitable PU lacquers.
If stored correctly (at least 20 °C room temperature), the final hardness of the coating is achieved after a week.
Please apply a test coat under real conditions!
Please also observe the separate technical information on the subject “Polishing/Buffing”. Depending on the required surface finish and backing material, pre-priming is possible, for instance with Hesse PURsealing filler DP 4791-9343 or Hesse PUR-sealing filler DP 4791-9005. An intermediate coat of Hesse PUR-coloured lacquer DB 45245-FT applied in the same colour as the selected Hesse PUR brilliant lacquer DB 44099-FT, between filler and high gloss coating, greatly improves the outcome of the high-gloss structure!