The Best Caulk Caps You Can Find, According To Reviews

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Caulk is the perfect waterproof material to use to seal gaps around windows, doors, and plumbing fixtures. You can use it to prevent leaks and mold growth in areas where you might have moisture penetration. After you take the time to find the perfect caulk for the job, though, you might only use a little bit of it. That's where a caulk cap can save the day.

Caulk caps plug the hole in the tube to prevent air from reaching the material inside, keeping it fresh and ready to use again in the future. Several different designs of caulk caps exist, including designs that are rubber caps you'll roll over the end, caps with pins for the nozzle hole, and caps that screw into the nozzle hole.

Why is it important to protect the caulk inside the tube? After applying it around a window or bathtub, the material will slowly begin to dry and harden because of the evaporation of the solvents when they're exposed to air. As soon as you cut open the tube and expose the material in the tube to air, the same properties apply to the solvents. After you do your initial application, the rest of the caulk in the tube might dry out before you have a chance to use it again, making it worthless. Although you can try home remedies to keep your caulk tube from drying out, caulk caps deliver better results. We looked at customer reviews to find the cap designs that will help you do a professional-looking caulking job each time, no matter how long ago you opened the tube.

The KAEZDD Caulk Caps cost $0.20 apiece and ship in a 40-piece kit. Just place the rolled up material over the open nozzle and roll it down the nozzle. (Yes, it kind of works like a condom for the nozzle.) Many of the top-selling caps on various online retailer websites use this same roll-down design and consist of rubber. This design will work for any similar kinds of tubes and bottles where you'd snip off the end of the tube to reach the adhesive, glue, or caulk. Because they consist of stretchy rubber, they're suitable to use with almost any size of tube or bottle. 

This KAEZDD product has a 4.7-star rating on Amazon, making it one of the highest-rated caulk-saver products on the site. One customer reviewer said they work as expected and deliver excellent results. "They're easy to install, they have a great seal, they stay on the tube, they're easy to remove, and I use them on every job." Another customer reviewer says the low price for these caulk caps is well worth it when you add up all the caulking material preserved over the years. "I've ruined more tubes of caulk than I care to admit. Came across these and decided to try them out. ... The fit is snug enough to keep air out and, so far, so good."

For a different design, the Baderke Caulk Saver ($1.40 apiece) uses a firmer rubber cap attached to a long pin. The cap fits over the open end of the nozzle, sealing it from the air, while the pin goes into the tube for stability. The rubber cap has some flexibility to it, allowing it to stretch to slide over wider nozzles as needed.

Caulk tube manufacturers use a long plastic nozzle at the end to help you direct the caulk into a tight space. The long pin on the Baderke caulk cap works nicely to match up to the length of the nozzle. From the top of the cap to the end of the pin is 4 ⅓ inches. One customer reviewer said the pin is one of the best features of this design. "Have tried several types of caulk savers, and these are the best. I like the probe that goes down in the tube to help keep the nozzle open."

Customers generally like this product, giving it a 4.6-star rating on Amazon. One customer reviewer said this design works as promised. "Love these little caps. They seal the end air tight, and the tube is ready for use days or weeks later." Another customer reviewer says this Baderke design is far more effective at preserving caulk than any DIY remedies. "These are the best solution to preserving caulk I have found. Have tried the nail, the plastic wrap, the nail with plastic wrap, but this works."

The CAMGJORT Caulk Saver Cap ($1.67 apiece) uses the same long-pin design that the Baderke model uses. However, CAMGJORT adds a shank with threads near the top. Rather than sliding a cap over the nozzle, you screw the shank into the open nozzle to create a tight fit. This design closely resembles a DIY method of preserving a tube of caulk with a nail or screw, but the CAMGJORT design creates a tighter seal against air entering the tube because it consists of flexible silicone. 

It's a popular choice among customer reviewers, with a 4.5-star rating on Amazon. One customer reviewer says these models are far more efficient than any DIY method you might use. "To all those who wrap half-used caulk cartridge nozzles in tape — and hope — just buy these and know."

The length of the CAMGJORT plug provides extra stability. It measures 158.3 millimeters in length (or about 6 ¼ inches). The shank should tightly plug holes in caulk nozzles ranging from 0.18 to 0.38 inches in diameter. It has a flat handle at the top, which simplifies twisting the shank into the opening on the caulk tube — and pulling it back out later. One customer reviewer appreciates the ease of use with this design. "These plugs insert easily, and they are easy to remove, leaving a channel for the product to come out of the nozzle. ... The entire tube of caulk remains soft."