How to Varnish Your Acrylic Painting: Spray vs Liquid

Madhula
Aug 18
3 min read

Varnishing is the final step that gives your acrylic paintings a polished, professional finish while also protecting them. In this blog (and video below), I’ll show you how to use both spray and liquid varnishes, explain the different finishes available, and share tips for applying varnish on small and large canvases.

Types of Varnish for Acrylic Paintings

There are two main types of varnish you’ll find in the market:

Spray varnish – comes with a nozzle for easy application.
Liquid varnish – poured out and applied with a brush.

Both options are available in gloss, satin, and matte finishes depending on the look you want.

When and Why to Varnish

Protects your painting from dust, dirt, and UV damage.
Evens out the surface, reducing patchy shine.
Enhances the depth of colors.
Essential for both small practice works and large gallery pieces.

How to Use Spray Varnish

Spray varnish is quick and convenient, especially for smaller paintings or when you want an even, streak-free finish.

Preparation: Place your painting on a flat surface in a dust-free, well-ventilated area. Protect the floor or table with old newspapers or a drop cloth.
Distance & Angle: Hold the spray can about 12–18 inches away from the surface. Keep the can upright and spray in light, even passes.
Application Technique: Start spraying slightly off the canvas edge, then sweep across in a continuous motion, releasing after you pass the other edge. Overlap each pass slightly to avoid missed areas.
Drying & Coats: Allow the first coat to dry completely (usually 15–20 minutes). Apply 2–3 thin coats rather than one heavy coat for a smooth, even finish without drips.
Tips: Don’t spray too close, or the varnish may pool. If the surface looks patchy after the first coat, don’t worry — the second and third coats will even it out.

How to Use Liquid Varnish

Liquid varnish gives you more control and is often preferred for larger canvases. It does take a bit more care, but the results are worth it.

Preparation: Place your dry painting flat on a clean surface. Use a lint-free cloth to gently wipe away any dust.
Brush Selection: Use a wide, soft, flat brush (varnish or hake brush). Avoid stiff bristles as they can leave streaks.
Pouring & Loading: Pour a small amount of varnish into a clean container — never dip directly into the bottle. Dip the brush lightly and tap off excess to avoid drips.
Application Technique: Apply the varnish in long, even strokes, moving in one direction across the painting. Work from top to bottom (or left to right) to cover the surface evenly.
Second Coat (Optional): Once the first coat is completely dry (usually a few hours or overnight), apply a second coat in the opposite direction (e.g., horizontal if your first was vertical). This helps eliminate streaks and ensures full coverage.
Tips: Don’t overbrush — once applied, leave it to self-level. Work quickly but gently to avoid bubbles. If you see bubbles, lightly go over them with the tip of your brush.

Tips for a Perfect Finish

Always let your acrylic painting dry completely before varnishing.
Avoid overloading your brush with liquid varnish.
Use gloss for vibrant depth, satin for balanced finish, and matte for a subtle effect.
For larger canvases, liquid varnish may provide more control, while spray is convenient for smaller works.

Conclusion

Varnishing is the final touch that not only protects your acrylic painting but also enhances its beauty. Whether you choose spray or liquid varnish, the key is thin, even coats and patience between layers. Watch the video tutorial to see each step in action and achieve that flawless professional finish.

Want to take your acrylic paintings to the next level? I’ve put together my top 25 tips in a handy guide. It’s packed with simple, practical advice you can start using right away. Grab your free copy and start improving your acrylics today!

Download Your FREE Copy