Caulking--you need to cut the nozzle at a 45 degree angle and load the caulk gun properly--Lots of videos--watch first before buying.

AI-To caulk a tub or sink, first, remove old caulk and thoroughly clean/dry the area, then apply painter's tape for straight lines, fill the tub with water (for tubs), apply a consistent bead of silicone caulk at a 45-degree angle, smooth it with a wet finger or tool, and immediately remove the tape for a clean, waterproof sea