Depending on how big your projects are I use the 2" 3m plain painters tape. There are a lot of variations of painters tape. I use an L bracket to keep my work piece square to the router. I place the material down on the spoilboard and draw with a pencil an outline of 3 sides. The forth side is the L bracket and part of the 3rd side. I place the tape down and go past the pencil line and push the tape down with my fingers. The painters tape must adhere as well as it can. Then I take my material and flip it over so the side against the fence will be facing toward the back of the machine. I place the first row of tape along that edge. Then cut tape about the same length and place it as close to the edge of the first row as possible and press it down with my fingers. Repeat this until you get all of the project covered. When I have an inch or less for the last row I just skip the tape. If you are cutting small parts close to the back edge then just let the tape over lap.
I then put my Titebond Medium CA glue down on each row in an S pattern. I then take the material and hold it up at a 45 degree angle against the L bracket and rotate the material down pulling the bottom against the L bracket. I hold pressure down for a few seconds to make sure I spread the glue evenly. You will learn by trial and error how much CA glue is enough and how much is too much. Obviously you want the CA glue to hold down but not so much it squeezes out between the rows of tape. If it does squeeze out it is not that bad but you must scrape it off the spoilboard to keep the next project from being uneven on the spoilboard.
When the project is done I use a putty knife to place under the tape on the spoilboard that I let run long and run it up under the project and gently pry up. Small parts may remain stuck to the top layer of the tape and the overlapping waste may come up in a single piece or may break up depending on how thick it is. After you get the majority off you can pick your finished pieces up off the tape and then finish removing the painters tape in preparation for the next project.