https://www.goldenpaints.com/technicalinfo_polvar
Great technical instruction sheet by Golden Paints on specs for Golden polymer varnish, including why and how to paint an isolation layer first (acrylic soft gel/water, thinned, 2:1 ratio, brushed or sprayed thin, to seal and separate painting layer from varnish layer) before coating with polymer varnish, also thinned/see article for ratio.
Also explains why and how to blend or build up various finishes to achieve desired result, including instructions for avoiding milky appearance if using a satin finish.
I tried converting this page to PDF without success, but I was on android. Try it on PC!