I grouted 5 bathroom floors and 2 showers in about ten hours including base tile. Good luck doing this with a trowel. Instead of using a regular caulking trowel, use a rubber trowel or better yet, a Bondo trowel/caulking paint and then a sponge. You still need to make small areas as instructed. No waste as excess material is quickly removed and returned to the bucket for reuse. Not for use with water mixtures.
Industrial-Strength Double-Sided Woodworking Tape, 4"X30 Yards Yellow CNC Machine Tape For Woodworkers And Crafters - Removable Woodturner'S Tape From XFasten
52 Review
High Tensile Strength Duct Tape Silver, 5.8mils, 2 Inches x 50 Yards - All-Weather Duct Repair Tape for Commercial Use, Heavy-Duty Repair, Packing with Temperature and Shear Stress Resistance - XFasten
39 Review
Strong & Wide White Gorilla Duct Tape, 2.88" X 25 Yd, Pack Of 1
24 Review
XFasten Super Strong Duct Tape, White, 2" X 50 Yards Waterproof Duct Tape For Outdoor, Indoor, School And Industrial Use
33 Review