is reader-supported. When you buy through links on our site, we may earn an affiliate commission. Learn more

12 Best Waterproof Bathroom Caulk In 2024

Sonya Harris
  Feb 26, 2024 5:04 AM

We independently study, test, and review 12 Best Waterproof Bathroom Caulk products before making recommendations. We’re testing the Gorilla, Momentive Performance Materials, UIOCSSC, KOMIWOO, Oopsu, LUNNTE, SNAIL GARDEN, HGjewelry, LvSenLin  for a for a future update to this guide.


Choosing the correct caulk for your shower or bathtub is critical. Not all caulk is created equal, and the type of caulk you use depends on what you're trying to do with it. 7 top caulking products for the shower and bathtub are here.

The caulk you put on windows will be different from the caulk you use in the bathroom.

When a bathtub contacts a wall or floor, caulk is used to fill in the gap between them. Tub and shower cracks can also be repaired with this product. Moisture must be prevented from entering the floor or underneath the tiles. There is a risk of water damage and mold if moisture is allowed to get into these locations. If you want to avoid these and other water-related problems, you must use the correct caulk for showers and bathtubs.

Compare Products

Last update on 2024-02-26 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Buying Guide

Type of Caulk

In a bathroom, there are a variety of caulks that can be used for various purposes. To assist you in making a decision, we've listed a few of the available descriptions.

Silicone Caulks – Applied on metals, glass, and plastics to keep water out, they repel water. When compared to other caulks, silicone takes the longest to dry.

Acrylic Latex Caulk – A porous and non-level surface can be caulked with this flexible caulk. Acrylic caulk, on the other hand, is less water-resistant than silicone caulk. A wet section in the bathroom can be used with this product.

Polyurethane Caulk – High water places like showers and baths will benefit from this. Mold and mildew spores cannot develop on it since it is water-resistant. It's also a powerful glue.

Best Shower Caulk Buying Guide

Mold & Mildew Resistance

Shower stalls and bathroom surfaces are common places where caulk finds itself in contact with water.

Mold can grow if the caulk isn't smooth enough, as water will stick to the rough places. The area is unsanitary because to mold.

The black blotches at the perimeter of the acrylic tub or shower will also make you uncomfortable.

This means that the finest caulk for shower surrounds should be mold-resistant. Caulk must also meet these requirements when used on pipes and fittings near a septic system.

This functionality is also required for exterior and ornamental caulks. As a result, mold growth on these items will be considerably slower than in the bathroom because they are not exposed to water.

When selecting a sealant for your shower enclosure, be sure to look for one that is resistant to mold and mildew.

Water Resistance

To properly apply caulk to a leak or a broken area, you can't skip over this step. The caulk you choose should be waterproof, even if it's included in most of the products on the market.

Mold will quickly grow on your caulk if it isn't waterproof, and you'll have to replace it with new caulk in a short period of time.


The caulk must be elastic in order to avoid breaking when subjected to movement. Caulk for a ceramic tile floor or bathroom wall can be purchased without this test if it's a permanent fixture (if you want).

However, if you plan to use that on shower doors or window frames, your caulk must be able to withstand the contractions and expansions that occur. When it comes to bathroom and shower tile flooring, shower grout is essential.

Even in non-moving areas, it's a good idea to pick up some elastic caulk. Using this function, the new caulk will not crack or come loose in a small area.

Cure Time

When you're the only one in the house, it's especially difficult to refrain from using the restroom for days at a time. If that's the case, we'd advise you to opt for a caulk that sets quickly. The amount of time it takes for the sealant to fully set and be ready for use and water exposure is referred to as "cure time."

This can take anything from two to ten days. Consider alternate options if the product takes more than two days to cure!

Application Process

Shower caulks often come in one of two container styles. Squeeze tubes and cartridges are both options. Each alternative has its own application process, which is why we're mentioning it now. Caulking guns, on the other hand, are required to apply products that come in cartridges.

Squeeze tubes, on the other hand, do not necessitate the use of a cartridge gun. Because of this, they are suitable for little bathroom repair projects. Contrary to popular belief, cartridge-style seals are better suited to sealing operations requiring greater force and/or volume.

Either way, go with the one that has the easiest applicability.

Surface to be Caulked

Another thing to keep in mind is that some adhesives are more suited for particular surfaces than others. In other words, not every sealer on the market is suitable for use in showers.

In addition, you must take into account the type of shower surface you plan to operate on.

That way, you can see if the glue is going to stick to the surface. Shower adhesives can be utilized on a variety of bathroom surfaces, which is great news for you. Products that stick nicely to surfaces are likely to be found here.


What is the best caulking to use in a shower? 

As long as it's made of pure silicone, it'll stick to most bathroom surfaces.

What caulk is mold resistant? 

If you live in a location with a lot of water and humidity, silicone caulk is the best option.

Can you caulk over mold? 

Mold can be caulked over, but it's not recommended. Before applying the new caulk, remove as much of the old caulking as possible. Even though the new caulk is likely to destroy the mold, you should check to see whether it's lurking beneath it.

Should you caulk between shower walls?

Water leaks can be prevented by caulking all of the surfaces around a shower or tub. A caulked shower, if installed correctly, should be watertight, have minimal mildew and mold, and cause the least amount of water damage to the home.

How often should you caulk your shower?

The caulk in your bathroom should be replaced every five years, even if there are no signs of wear and tear. Caulking damage from peeling, cracking, mold, and mildew can be avoided with frequent cleaning and replacement.

How long will it take for caulk to be watertight?

There is a big difference between caulks that dry quickly and those that take up to 24 hours to dry completely.

When caulk has just been placed, it's best to wait at least one night before using water to wash it off. Caulk curing times can be affected by the weather, as well.

What Kind of Caulk Do You Use for Baseboard?

For baseboards, latex caulks are the finest option. These caulks adhere well to the baseboard and have less of an impact on the interior's aesthetic appeal.

Caulks can't be sanded, so you should check to see if you can use spackle or joint compound in place of caulk on surfaces like baseboards or drywall.

To learn more about sanding in general, have a look at our guide to the best drywall sander.


The introduction of caulk has had a significant impact on construction projects around the world. If this product hadn't been invented, you wouldn't be able to accomplish many of the things you can now do for less than ten dollars.

Thanks to the 16th-century Europeans who gave us the recipe for this remarkable product.

The mold-resistant caulk made it easier for us to seal bathroom surfaces, showers, and other cermaic fittings.

For shower stalls and tubs, we've compiled a list of the top caulking materials currently on the market.

In-depth research and AB testing were used to narrow the field of candidates, and the end result was a list of the world's top products.

2 ratings