What is that stuff called that glosses over a picture?

Ava G

New member
So I've been working on a piece where I glued a bunch of different magazine clippings and pictures I've ripped out onto a canvas so that it formed a picture, I know there's a certain substance you can buy to paint over the top of it so it flattens it all down and creates a nice glossy finish.. Does anyone know what it's called or where i can buy it?
That was a really convoluted description haha but hopefully someone knows what i'm talking about!!
Thanks!
 
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