You get a large roll of paper, sometimes called "red rosin paper" or "builder's paper" to put underneath your finishing to catch drips and overspray. If you want to get really fancy, you can make a little roller to fit under the edge of your work table and/or a cutoff edge on the opposite edge (I'm not there yet). Another option, if you have a source is large cardboard boxes (think appliance boxes) that you can open up and lay on the floor to protect it from stripper, stain, solvents, and finishes (this I do have).