Using Spray Varnish
Dry Time: With all varnishes, make sure paintings are completely dry. Allow 3 to 5 days for acrylic works and 6 to 12 months for oils. Dry time may very and depends on thickness of paint application as well as environmental humidity.
Removal: Remove old varnish before re-varnishing a work. Varnishes can be removed with paint thinner or other mild solvents only when varnish is originally applied to completely dried works. When used on wet or semi-dry works, the use of spray varnishes may damage artwork; varnish may not be removable at this point.
Test: Always test sprays on a scrap surface before using on a final work.
Application: Always use in a well-ventilated area with the temperature above 65 degrees Fahrenheit and relative humidity below 65%. Follow safety instructions carefully. Not suitable for use by children.
Set work vertically. Shake can vigorously for 2-3 minutes before each use. Spray at least 18” from artwork. Use a slow, even motion to coat the surface. Start spraying off the canvas and do not use a swinging motion, as the can will get closer to the canvas. Use a deliberate vertical motion: left to right, right to left. Overlap the spray about a half inch on each pass. If needed, place a light behind you, as it will make it easier to see the varnish on the painting. Light coats are best. If varnishing a large work, apply spray varnish half way down and turn the painting 180 degrees, then complete the varnishing. One coat covers. Additional coats may be used if heavier applications are desired. Wait 5 to 7 minutes between coats. Never check if the varnish is dry by touching the painting. Instead, test on the side of the canvas. Turn painting 90 degrees before every coat. Keep away from open flame or heat sources.
Maintenance: Prevent clogging by cleaning the nozzle before and after use. Spray short spurts of the product for 3 seconds. Then turn the can upside down and spray for a few seconds until no more material sprays.