The Right Way To Caulk See the photos below to obtain a perfect caulk line. Painter’s tape is carefully placed to outline the caulk line. Fine tuning the tape barrier. Painter’s tape applied to both sides of the caulk line. Caulk is applied in a thin bead. You can then smooth out the line with your finger after the line is applied. The painter’s tape is removed to reveal a perfect caulk line.