okay so i need help and fast lol... i took photography at my high school this semester and just last week my teacher had me hand color one of my black and white prints that i did for fun and now im trying to do more of handcoloring on my other prints that i never had to turn in to give as christmas presents but i have one problem. she had me spray the print with this clear acrylic matte stuff? i think thats what it was but im not sure because it was a week ago and what not i guess my question is if spraying it with that is necessary for the colored pencil to not damage the print she told me it would give the a "tooth" or a bit of an edge so i could work with colored pencils, so if it is necessary whats a good product to buy to give it that edge?
and i WOULD ask my teacher but she left town suddenly for a funeral so i had no chance to ask her so any help would be MUCH appreciated. thanks in advance