Over forty years ago, the use of water-based varnishes was relatively new and it was not recommended to apply an oil-based varnish on a water-based stain, or a water-based varnish on an oil-based stain. However, times have changed and this practice is now common. The results and resistance are not to be feared if you respect the appropriate application techniques and drying times. To avoid any problems, make sure to follow these instructions carefully.