Common Caulking Mistakes Diyers Make

Failing to Prep

The first common mistake happens before you even open the caulk tube.

Without proper surface preparation, your new caulk will not last. As tempting as it is to quickly lay a new bead and forget about it, you need to ensure the surface is dry, clean and sound before applying caulk.

Completely remove the old caulk, flaking paint or crumbling grout. Repair any surface damage, wipe the area clean and then lay the new bead. “Be sure it’s as clean as possible and then completely dry to ensure a proper seal once caulking is laid,” Fabry says.

This is especially important when recaulking the seam between a bathtub and tile surround. Remove all old caulk before applying a new bead.

Overcutting the Tube Nozzle

When you open a tube of caulk, the tapered tip on each tube allows you to custom-size the opening for your specific job.

Many people cut the tip and start caulking without regard for the width of the crack they plan to seal. This can result in too much material on the surface, poor adhesion and/or a sticky mess. Fabry suggests starting small and then adjusting the opening if needed.

Cut your tip slightly narrower than the opening and use pressure and speed to adjust the width of the bead. I use a utility knife to cut the nozzle rather than the included cutting blade on most caulking guns. A utility blade allows for more accuracy and a cleaner cut.