Best Silicone Sealers of 2025

"I found it to be great for reglueing my flexible rubber seal and making my old Garmin Legend GPS waterproof."

"I managed to fix a water leak in my door's plastic lining, and I can confirm it seals well when applied generously."

"Unfortunately, the tube was bent, and the silicone was hardened, making it tough to get out. It also didn't adhere well to the metal surfaces I cleaned beforehand."

"This product might work for rough sealing, but it doesn't flow smoothly like regular silicone. So, I had trouble making a smooth bead around my glass mirror and ended up with globs and smears."

"I was thrilled to find the actual black silicone. The dark grey options just don't work as well for my needs."

"I had a mishap with my tire, and thankfully I remembered about Permatex Black Silicone Adhesive Sealant. It filled in the cavity perfectly, and I passed my inspection without needing a new tire!"

"Using this black sealant for my Subaru's trailer-wiring plug was a great choice. It’s a bit messy, but once it dried, the connection was fantastic. I appreciate that I could puncture the tube with the cap!"

"I've used this brand for various projects, and it has never let me down. It holds up well against the elements and is easy to work with."

"I sealed some ductwork near the furnace, opting for this over metal tape. It has a strong odor, so I recommend using it in a well-ventilated area. But it seals well and withstands heat."

"After replacing a glass panel on our fireplace, I used this silicone for installation. I'm pleased to report that it has been holding strong without any issues for two years now."

"This product was terrible; it has not dried in four days and made a mess everywhere. I feel like I wasted my money on this!"

"I used this to hold a seal in a sinker EDM, and it works great for that purpose."

"I apply this on almost everything for my trucks and ATVs; it works better than other brands I've tried."

"After performing a rear diff service on my 2016 F250 SD, I used Motorcraft gasket silicone. I might have applied a bit too much, but after waiting two days, I refilled it, and there were no leaks even after pulling my Fifthwheel for over 10,000 miles."

"This product is fantastic! I use it on the entire motor, and it works great for intake manifold seals."

"I've been using this product for 30 years and it works great for securing gaskets exposed to high temperature. It acts like a tacky glue and doesn't smell after curing. I highly recommend it!"

"Initially, I overdid it and made a mess, but when I followed the directions, I achieved a perfect, leak-free seal on my hot tub heater connections. The results are long-lasting!"

"I used this product for an engine rebuild to ensure it was safe for the o2 sensors. It performed exceptionally well, giving me peace of mind."

"I used this to reseal the seams on my older Tarptent Rainbow tent. The silicone sealant worked great when I diluted it with mineral spirits, applying smoothly along the seams. There was more than enough sealant in the tube to finish the job, and I'm very happy with the results."

"This stuff is amazing! I bought it to seal my tent seams, and it worked quickly. I even had some left over, which proved useful when my inflatable hot tub developed a leak. To my surprise, it still remained runny, and it filled the gash perfectly. I was shocked at how well it adhered to PVC, and I’ll definitely use it for other repairs."

"Living in the PNW, a water-tight tent is essential, and mine leaked at all seams until I applied Seam Grip. The application was a bit tedious for my 10' x 20' tent, but after testing it in heavy rain, there were no leaks. I used 1.5 tubes, and it's clear in color, making it barely noticeable unless you look closely. I strongly recommend this product."

"I was a bit apprehensive when I received my order because the packaging looked like it had been opened before. It was taped and stapled shut, but I found the seal under the cap intact. This reassured me that the product was untouched. I'd definitely purchase from this seller again."

"I applied a thin layer of this gasket sealant on my 12 Valve Cummins Timing cover, and it performed exceptionally well. Just a heads up, you need to act quickly since the tooling time is only half an hour, and it starts to skin over after just a few minutes."

"This silicone works wonders! I really prefer it over the other black or blue options available."

"I am used to 5200 series glue; I'll see how this compares."

"This is a great product! Buying online was so much easier than visiting the marine store!"

"I found this product highly recommended for hull penetrations. It worked well for my radio antenna feed-through and helps prevent spider cracks from screws and holes in the gel coat."

"I realized this is superior to most standard caulk products for a shower and bath, but I found it difficult to squeeze out of the tube. I ended up discarding the nozzle accessory because it took all my strength to force the caulk through that narrow path. I'll see how it holds up in our shower tub combo."

"I used this to reattach the glass window that had fallen out of the bracket in my 2000 Mustang GT Convertible. It's been about 3 months now, and it has worked great so far!"

"I've relied on Super Silicone 7 for years. Just yesterday, I used a 10-year-old container on a drain pipe, and it worked perfectly! Unlike the silicone in tubes, which hardens in 1-2 weeks, this metal container keeps it usable for much longer. As a landlord, I always keep this in stock, and it's also excellent for auto gaskets!"