How do you fill gap between tub and tile?

Fill Gauzes up to 14 inches wide with caulk. If you have a tile on the wall next to the bathtub, select a caulk that corresponds to the color of the cave. If your caulk is less than 18 inches wide, use caulk regularly fills Gauzes larger than 18 inches with a smooth caulk.The caulk can be used to fill gaps up to 1/2 inch in width. Pick a caulk that matches the color of the tile on the wall next to the tub. If you have a small gap, use regular caulk and fill it with a sanded caulk.