Nadie sabe nada del tema?
Saludos.
tal vez la causa sea esta, sacado de la misma pagina de petrof.-
Petrof upright pianos are produced in two variants. Standard instruments intended to climatic conditions of middle climatic zones have some edges or hidden surfaces without special finish. The instruments that are intended for extreme wet climatic conditions, the Tropics, are Tropicalized as well as all the grand pianos. "That means all the surfaces including hidden surfaces" are special coated with polyurethanic or acrylic coatings against diffusion of air humidity.
Un saludo,
Ummmm, entonces será eso, que el piano este está preparado para soportar climas humedos.
Gracias por las repuestas.
Un saludo.