How to Varnish acrylic paintings. The best DIY way to varnish acrylic paintings. Should I varnish acrylic painting? Do acrylic painting need varnish? Yes they do. There are spray varnishes, liquid, solvent based, flexible and hard. All about matte and gloss varnish. At hART pARTY we take the mystery out of professional art tools. We have product testing. In fact we have the only consumer product testing that matters---Sticky Fingers. These are varnish tips and tricks you can actually use even as a first time painter. I believe there is no reason art should be difficult or overwhelming. Consumer Advocate in art just for you. This is why you should varnish, when you should varnish, and with what you should varnish. Hear facts from the BIG BOOK of acrylic paint by liquitex. Learn all about the wonders of Gloss Medium and Varnish by Liquitex. These are my opinions. These are my art supplies. I am unpaid "literally" by anyone.