If you’re building a pond, fountain or waterfall you’ll need to seal any gaps and cracks in your construction. Great Stuff Pond & Stone Insulating Foam Sealant is an excellent choice for sealing large cracks and holes.

It’s also a good choice for securing stones used to edge ponds and landscaping. It also works as a water-shedding sealer for stone, rock, masonry and concrete.

What is Great Stuff Pond & Stone Insulating Foam Sealant?

Great Stuff Pond & Stone Insulating Foam Sealant is a polyurethane based foam sealant that expands to fill gaps and cracks. It is ideal for sealing ponds and streams, as well as around rocks. It is also non-toxic and can help to prevent leaks, decrease energy costs and maintain a comfortable water temperature.

Home Improvement:

This polyurethane foam dries quickly, creating an airtight seal that is durable and resistant to mold and mildew. It is easy to use and will not damage surrounding vegetation or the environment, making it a safe choice for home improvement projects.


This product is ideal for creating ponds, waterfalls, streambeds and other water features. It can also be used to add a decorative touch to these elements, making them even more attractive. It is also an excellent choice for setting and securing cap stones in retaining walls.

DIY Work:

If you’re looking to spruce up your outdoor space with a bit of DIY work, it’s essential to find the right sealer for the job. The right sealer can help protect your outdoor space from the elements and ensure that your hard work lasts for years to come. There are many different options to choose from, and it is important to consider the needs of your project before you begin to decide on which sealant is best for the job.

For example:

If you have small holes to seal, plain old silicone may be the best choice for your application. However, if you have larger areas to cover, you might want to look into something more complex. A great sealant for larger surfaces might be a liquid rubber, which is a one gallon can of sprayable sealant that adheres to wood, metal, and concrete.

How to Use

Great Stuff Pond & Stone Insulating Foam Sealant is a polyurethane foam sealant designed to be used around water features. This insulating sealant fills gaps, cracks and voids in decorative materials and helps direct water flow to help improve the aesthetic of a waterfall or pond.


This sealant is waterproof, mildew-proof and UV-resistant, making it ideal for use in outdoor environments. It dries quickly, forming a durable, airtight seal that prevents water loss and maintains optimal temperatures in the pond or stream. It’s also non-toxic, making it safe for use around a koi pond or other water feature.

Different Types

There are a few different types of insulating foam sealants that you can choose from depending on your needs and budget. For small cracks, a regular silicone spray can work well, but for larger holes and gaps you may need something more robust such as this three-pack of expanding foam from Great Stuff that’s able to fill and seal large spaces up to an inch across.

Foam Sealant

Another type of foam sealant from Great Stuff is the Gaps & Cracks insulating foam that can be sprayed into a gap or crack and then dries to form a tight seal to keep out air and heat. It’s a great solution for areas where air is infiltrating your home and it can also be helpful in moderating room temperatures by stopping the buildup of drafts.


While it’s a bit messy to use, many reviewers found that Great Stuff foam sealants are simple to apply and do a great job of sealing cracks and holes in both interior and exterior spaces. This sealant is incredibly versatile, making it ideal for a variety of applications. It is easy to remove and works on a wide range of surfaces, making it perfect for patching up sheds, cool

Safety Precautions

Everything You Need to Know About Great Stuff Pond & Stone Insulating Foam Sealant

Ready-to-use and fish-friendly, Great Stuff(tm) Pond & Stone(tm) is an expanding foam that fills gaps in decorative materials and helps direct the flow of water in waterfalls, ponds, and streambed construction. It cures in 8 hours to form a water-shedding bond for stone, rock, masonry, concrete and most other building materials. It is also a good choice for koi ponds because it is safe for fish.

Polyurethane-based foam sealant

This polyurethane-based foam sealant expands to fill gaps and cracks, helping you direct the flow of water in your project to go where you want it to go. It is black and can blend in with rocks and shadows to help keep your design looking clean and attractive.


Creating water features with pond and waterfall pumps is a great solution for directing water flow. It is simple to form and shape to make stunningly attractive presentations. With this option, you have immense flexibility in designing your dream

Dupont markets its Great Stuff(tm) Black Filler, Sealer and Adhesive as having the ability to camouflage into its environment while being impervious to moisture. Due to its waterproof properties and resistance to fading, epoxy grout is highly popular for use in outdoor areas such as around fountains or rock waterfalls.

When using this material in outdoor settings, it is important to be aware that prolonged exposure to sunlight may cause discoloration. Therefore, care should be taken to make sure that the material is not exposed to direct sunlight for long periods of time.

Insert the straw into the foam sealant and dispense it into the desired area. Allow the foam to expand and fill any gaps or cracks that are not completely filled. Once it dries, you can trim excess material or shape and paint the foam.

The company encourages customers to wear chemical-resistant gloves and splash protection while using this product. This is to prevent accidental exposure and possible spillage of the foam. It is also to protect yourself from chemicals that can leak out of the foam as it dries.

This product should not be applied directly to bare wood and should be kept out of reach of children. It can cause skin irritation if it comes into contact with the eyes, nose, or mouth. Food should be kept in a cool, dry location that is away from any sources of heat or open flame.

Final Words

The Great Stuff Pond & Stone Insulating Foam Sealant is a great way to enhance and extend the life of your landscaping. This foam is an ideal solution for sealing up cracks in masonry and trellis structures, creating a seamless and waterproof barrier that allows plants to grow and flourish.

You can also use it to fill in gaps in your pond or waterfall to improve the aesthetics of your landscape. The great thing about this insulating foam is its reusability – you can use it up to 30 days, allowing you to save money and reduce waste. It’s an eco-friendly and cost-effective way to keep your home.

Its clever design uses a dispensing straw to create a fine textured finish. Unlike the old fashioned broom and a spray bottle, this nifty foam requires no messy clean up.

Its large capacity allows for use in the largest of spaces and its clever design enables the user to see the results as they go, saving time and effort. The foam has a long shelf life so you can get more bang for your buck by storing it in a cool dry place away from moisture and heat.

By Alexa Grace

Kate Johnson is a writer. She writes books and stories about children. Sometimes she writes about imaginary friends, other times she writes about real people. Kate's stories are always exciting and full of mystery. My Profile.

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