You could use a fine mist spray bottle to make the painting less messy for students in a classroom setting. Students could use different colors of paint in their spray bottles with multiple stencils in an additive/layered process to create multi-colored designs. Also, students could use basic geometric shapes for their stencils to introduce the lesson and then progress to the more detailed subject matter.
Olaf my name is Jesse and you came to my school dallow Primary School and if your reading this well made a drawing of you and I was planning if they would let me post the drawing I made of you, also I subscribed and your very handsome✌️🧓🌠🌌