Remove the aulk from where it connects. It is vital to clean thoroughly the tub by gently rubbing it with an scouring powder and pad.Sand the tub’s surface with your hands or with an electric orbital sander, and 120-grit sandpaper once the tub has dried completely. After sanding the tub, make use of an aqueous paper towel to remove debris and dust. Then apply a thinner for lacquer or a detailing compound.
Tile the area around the tub and flooring inside the tub using masking tape. When the tub is dry, remove the tape and seal the bathtub with caulk.