Wood as a building material is actually always in fashion and is also popular for window frames and doors. Its warm appearance and natural look make homes and gardens a beautiful place to live. To maintain the beautiful appearance and structural integrity, components made of wood need to be protected. This can be achieved with industrial impregnation with salts and additionally with glazes, oils and varnishes. This is especially important for woods such as pine and spruce, which are often used for play structures, pergolas and also in other structural areas. They are relatively unprotrected against fungi, insects and water. ...