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Originally Posted by Juan Martinez
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.
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Actually, a lot of them are real laquer. They're formulated to be compatible with photo emulsions, and won't really damage the paper underneath. But they're pretty toxic and fume-y, yellow with age, and cause immense heartache if applied over anything with a trace of moisture--water or oil. Three strikes, to my mind.
Best to use the materials truly designed for oil.
Best--TE