Lara
I agree 100% with Bill and Tom. The solvents in a lacquer would be very bad for oil paint. However, I wonder if the product called a "spray lacquer" really is a true lacquer or if the word is just used as a name. I'd be surprised if lacquer wouldn't hurt photographic paper, too.
Anyway, another good varnish besides Gamblin's superb "Gamvar", is Winsor & Newton's Artists Picture Varnish which they now sell in a spray -- both the high gloss and the satin finish. I'd stay away from any matte finish varnishes for oil paintings.
Hope it helps.
Juan
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