Hello, I have a paper stencil that I want to use to paint on a design on a block of wood that have that's painted with acrylic paints. If I glue down small portions, when I peel it off, will the paint me ruined? Would Elmer's school glue work better?
You will want to use an oil-based paint if it is going to be outside. If it will be inside, then you can use either latex or acrylic. Acrylic will last longer, though. So, I think you are on the right track.
Rubber cement and elmers glue will adhere and pull the acrylic paint off. Try using some small pieces of not too sticky masking tape or painters tape, and don't leave it on for more than the time it takes to paint it.