What is that thing and more?!? ART RELATED!?

What is that thing called?!?! You spray it over your work to preserve it so it doesn't get smudged and what not? I'm getting into art, I've always been, but just lost interest a while back, but anyways what are some good sketchpads and some good sketching pencils. I currently have strathmore and 2b derwent and 4b derwent...what else am I missing?

Thanks!
 
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