Product information "Universal Maintenance Lacquer, 1Litre"
Uses
For the protection and maintenance of high build glaze coated wood windows and foil-covered UPVC windows in interior and exterior areas.

Characteristics
Water-based product. Dries quickly, resistant to yellowing. Sheen level: silk gloss.
https://www.heinrich-koenig.de/media/dd/79/a9/1721203771/TDS_514500_Universal_Maintenance_Lacquer_2021-43.pdf
https://www.heinrich-koenig.de/media/ec/cf/cb/1721203731/SDB_514500_Universal_Maintenance_Lacquer_V2.22_EN.pdf