I have a solution to prevent dust from getting on a freshly varnished painting.
I was considering using spray varnish but I ended up going with a known tried and true Gamar gloss. I did change up and used a nice 1 1/2” Master trim brush of fine synthetic material. It doesn’t lose any brush hairs and doesn’t leave any brush marks.
But the game changer is this cardboard box that lets me close the top and prevent dust from getting in the painting.
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I made something similar to store wet paintings in between sessions to stop dust landing on the paint and to slow down the drying (oxidization) process.
I tend to use spray varnish and just do thin layers so they dry very quickly. Sometimes I figure dust is part of the whole process, just as it is part of life, bit like horse hair, my hair, insects which i am forever removing as i paint. Then again my paintings are not world beaters and will not hang in museums 100years from now as some of the ones on here may one day do.
The pizza box is a great idea @GTO