Hey #art people, what is that liquid glue-y stuff you can put on watercolor paper, paint over the spots you glued, and then remove them to reveal the area you wanted to be un-colored?

Masking liquid?

Magic liquid?

Masking glue?

Help a bud out. I am trying to find it online but have a brain like a potato. (:

#watercolor #gouache #help #artist #painting #painter #paintingtools