An application of varnish on your painting will protect your hard work from pollution and dust.
How to varnish an oil painting to avoid problems in the future
Oiling Out and the Cause of Dead Spots in Oil Paintings
Before You Buy Acrylic Painting Supplies
Benefits of Varnishing an Acrylic or Oil Painting
15 most commonly asked varnish questions – Mont Marte Global
Varnishing Oil and Acrylic Paintings - Everything You Need To Know – Chuck Black Art
Painting Techniques
Varnishing 101
Grumbacher Picture Matte Spray Varnish 11oz Can, Acrylic & Oil Painting
Varnishing Oil and Acrylic Paintings - Everything You Need To Know – Chuck Black Art
Oil Painting Over an Acrylic or Watercolor Underpainting – Which is Best?