Spraying

• Spraying is a straightforward technique that involves using a sprayer. This technique is suitable for paintings and drawings on paper, as well as prints and photos. Spray the varnish on the dried artwork placed vertically on an easel, keeping the spray can approximately 5 inches from your artwork. Allow the piece to dry. Spray varnish is available in two types: matte and gloss, also known as satin. Apply one or several coats of finish.
  
  

Brush Application

• Choose a varnishing brush, which should be flat and wide. The hairs of the brush should be long and made of either natural or soft synthetic fibers. Use a soft brush, so it won't scratch the artwork. Ideally, you should have a paintbrush you use only for varnishing. Dip the brush into the varnish, and wipe off the excess material. Apply only small amounts of varnish so you won't soak the paper.
  
  

Sponge Technique

• If you don't want to have visible brushstrokes on your drawing, use a soft sponge or a sponge brush dipped in varnish to finish your paper artwork. This technique is similar to applying varnish using a paintbrush, but you cover the surface quickly and without leaving brushstroke traces. Dip a side of the sponge in your varnish bowl, and gently blot it on a paper towel to remove the excess varnish. Press the sponge firmly on the artwork. Repeat this to cover the entire surface of your paper.
  
  

Resin

• Pouring clear casting resin over the finished artwork is another way of sealing paper. This technique is best if you used wax crayons or your artwork is thicker and has textures that require protection. Prepare the resin with the catalyst provided in the kit. Pour a thin layer of resin over the drawing. The resin hardens quickly and seals the paper permanently.