how to flat caulk finish
As shown in the drawing, I transform a spent plastic caulk tube into a custom-made tool. First, I cut the tube in half, split it up the middle and cut slots on both sides. Splitting the tube in half allows me to put a crease in the tube, which can come in handy for some caulk profiles. You can clip the end of the tool to create a flat bevel finish or leave it round for a coved finish. The interlocking flaps allow the tube to be opened for periodic cleaning.