Varnish removal is a consequential process that requires careful consideration and proper technique to avoid damaging the artwork. Golden Artist Colors recommends using a solvent, such as full-strength commercial mineral spirits or distilled turpentine, to remove varnish from acrylic paintings (Source ID: 4). It is essential to test the solvent on a small area first and work in a well-ventilated area with proper personal protective equipment (Source ID: 4).
The removal process involves saturating a soft cloth with the solvent and laying it over the varnished surface for 2-5 minutes (Source ID: 2). The cloth should then be removed, and the surface gently patted with a clean solvent-dampened cloth to remove the varnish (Source ID: 2). This process may need to be repeated until the varnish is sufficiently removed (Source ID: 3).
It is also recommended to apply an isolation coat before varnishing to create a barrier between the paint surface and the varnish, making removal easier and safer (Source ID: 1). Additionally, working in small areas (no larger than 2 square feet) and using a plastic sheet to minimize evaporation can help ensure thorough varnish removal (Source ID: 6).
Golden Artist Colors advises that varnish removal should not be taken lightly, and the task is often best left to a professional conservator, especially for works of special significance or unknown composition (Source ID: 5). If unsure, it is recommended to consult Golden's Technical Support team for guidance (Source ID: 9).