Best Industrial Joint Sealants of 2025

“I had issues with humidity creating a slippery garage floor. After using this sealant, I no longer have problems. It seals nicely and levels out on its own. Just remember not to overwork it!”

“I purchased this to seal the expansion cuts in my garage concrete. It flowed well enough to provide an air-tight seal in the cracks, although I had to use a lot of it. It cleans up easily from sealed surfaces.”

“After trying a cheaper product that failed, I switched to this one. The difference was AMAZING! It sets up quickly, self-levels perfectly, and gives a firm finish. I will always choose this for driveway repairs!”

"I find this product amazing for filling cracks and gaps inside my home. I use it for everything, especially in old, drafty areas. The only wish I have is for a longer extension for those hard-to-reach spots."

"While I thought this spray foam would be satisfactory, I faced some challenges with the nozzle. It wouldn't stay on, causing a bit of chaos as foam ended up splashing everywhere. Despite that, I couldn't help but laugh at the situation!"

"This product has truly changed my gaming experience. I used it to customize my Xbox controller for better ergonomics, especially due to my arthritis. It worked perfectly, making the handles more comfortable and reducing joint pressure."

"I found the mastic very easy to apply. It quickly sealed leaky AC ducts and outperformed tape, getting into those tricky folds and crinkles where tape fails."

"I used this duct sealant for my HVAC project and it was a breeze to apply. It set perfectly in the designated time, allowing me to finish my job like a pro."

"This mastic worked wonders for sealing all the joints in my heating ducts. It was exceptionally easy to apply and didn’t have any odor. After cleaning the ducts, I noticed a significant improvement in heat flow throughout our home."

“I used this as caulking to seal my Keel Guard edges on my motorboat. It's fabulous—sets pliable yet very firm, keeping water out. I also patched holes in the transom from an old transducer. I highly recommend it; it’s saltwater tough.”

“As a marine mechanic, I've used this on hundreds of boats along the west coast of Florida. It ensures a watertight seal, even below the waterline. Although it's messy and hard to clean, it's worth it. Once it's on, it's on—very hard to remove. Trust me, I've had it on my skin for days!”

“I've applied this 3M Fast Cure 5200 for various needs on my boat. It seals holes permanently, and I’ve never had any leaks. While it’s messy and not reusable, it sticks to nearly every material and is impenetrable to water. It's essential for quick patches on my boat.”

"I've been using Sika products for years, and I find them to be far superior to other brands. The adhesion is fantastic, especially for sealing around concrete and wood. I keep a tube on hand for all my projects!"

"I had a leak issue in my bathroom dome, and after applying this product to the joint, the leak was resolved. It performed exactly as I hoped it would, and I'm pleased with the results!"

"This product was a game changer for the cracks in my garage. It has great durability and versatility, allowing me to use it on various surfaces. Plus, it keeps the Cactus Wren from making a mess in my space!"

"I love how easy this product is to use for plugging gaps or holes around my house. It's incredibly durable and strong, easily filling in any gaps!"

"After using it, I was left with half a can. I was amazed at how well it worked for filling cracks in my walls, especially in cold weather. Now my room is just 1 degree different from the main living area!"

"I had an issue with my original order arriving without the application wand. But after contacting the seller, a replacement arrived within four hours. I'm totally impressed and satisfied!"

"I find this stuff great for sealing holes in my boat. It's thick and tacky, which helps hold gaskets while I mount them. It provides a strong bond that won't crack later. Just a heads up, it might not last long after opening, so I recommend keeping an extra tube handy. If you're worried about the tip blowing off, cut a larger hole and apply firm pressure. I've used it for various projects and it has never let me down!"

"I used this product to seal the stainless steel drain plug assembly to my fiberglass boat transom. It worked perfectly with a fast cure and no leaks, but I did let it cure for several days before launching the boat."

"The product itself is effective; I used it to seal the bolt holes for my boat engine. However, I ordered a pack of 6 and only received one. The seller was unhelpful with returns, which was frustrating since I needed the sealant right away. I'd advise anyone buying from them to ensure they don't need the product immediately."

"I've been searching for a reliable gap filler for different projects, and this one truly delivers. It fits perfectly into my home improvement tasks, providing the biggest bang for my buck."

"I found this product to be great quality and more affordable than what I saw at Home Depot and Lowe's."

"All my cans arrived in good condition, although they could have been packed a bit better. This product performs just as effectively as the higher-priced gap fillers."