Surface smoothness of the piano soundboard panels depends on the quality of the panels. That depends on their flatness and on the quality and age of the lacquer layer. All Petrof piano soundboard panels and parts are made from perfectly flat and smooth grade “A” materials.

Layers of high gloss Lacquered parts that are then varnished with polyester lacquers are very thick and it tends to reduce its volume (thickness) a little after some time. This contraction is characteristic just for polyesters. Therefore newly sprayed and polished surface is perfectly flat and smooth.

A gentle shrinkage of the lacquer layer can occur after several months or years and its surface can warp a little. Then it can appear not to be perfectly smooth. If these gentle waves become aesthetically unacceptable usually such parts can be re-sanded and re-polished.