Drywall Trowels for Taping, Bedding, and Finishing. The Curved Drywall Trowel is most commonly used for taping and first coat application. The curved blade applies additional compound that allows for shrink back. Curved Drywall Trowels are also excellent for finishing butt joints. Flat Drywall Trowels are the most commonly used, and are perfect for all types of drywall taping and finishing.