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🛠️ Seal it, bond it, own it — the pro’s choice for unstoppable fixes!
J-B Weld 31319 Black RTV Silicone Sealant & Adhesive is a premium, room-temperature vulcanizing silicone designed for sealing and bonding uneven surfaces. It cures in about an hour to form a tough, waterproof, weather-resistant seal ideal for automotive, household, and industrial applications. With over 40 years of trusted performance, this 3 oz. tube delivers durable, flexible adhesion that won’t shrink or crack, making it the go-to solution for professionals and serious DIYers.





| ASIN | B00ID8F8E4 |
| Best Sellers Rank | #15 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Fillers, Adhesives & Sealants |
| Brand | J-B Weld |
| Brand Name | J-B Weld |
| Color | Black |
| Compatible Material | Rubber |
| Country Of Origin | USA |
| Customer Reviews | 4.3 out of 5 stars 15,901 Reviews |
| Global Trade Identification Number | 00043425313195 |
| Included Components | no |
| Item Dimensions | 22.9 x 12.7 x 5.1 centimeters |
| Item Form | Liquid |
| Item Type Name | BONDING_ADHESIVES |
| Item Weight | 109 Grams |
| Item dimensions L x W x H | 22.9 x 12.7 x 5.1 centimeters |
| Item weight | 109 Grams |
| Manufacturer | JBWeld |
| Material | Silicone |
| Material Type | Silicone |
| Model | 31319 |
| Number of Items | 1 |
| Part Number | 31319 |
| Style | Industrial |
| Style Name | Industrial |
| Surface Recommendation | Countertop, Pipe, Sink, Tile, Tub, Wall |
| UPC | 043425313195 |
| Unit Count | 1 Count |
| Water Resistance Level | Waterproof |
| Water resistance level | Waterproof |
A**I
Works great
At first i used it with the nozzle but its hard to squish it out so I had to cut it from the second circle to make the hole bigger which worked, please do not force it through the smallest hole since Ive seen some comments complaining that it bursted open and made a mess. I would recommend you remove the nozzle when you are almost done and clean it properly by passing tissue through it, using some of that product leftover. While this might be messy and a bit wasteful it will prevent both the tube and the nozzle from drying up since the nozzle doesnt have a seal. Now i use it without without nozzle and it still works nice for areas that dont require precise application or tight areas and its an amazing adhesive, it says it dries in 1h but id recommend leaving it at least half a day, do the work at night and leave it overnight maybe. Ive used it to glue some shelfs in the kitchen and put spices and sauces which can be quite heavy, left milk and other heavy items to test the durability and its been 3 weeks holding all that weight, also used the glue to seal corners in the bathroom and its completely waterproof once dry. The next time u open the tube there will be a dried up crust on the top, if u squeeze a bit it should come out, i didnt throw it away and actually placed it back once im done using the product and this actually works as a second seal that prevents another dry crust. Overall amazing product.
E**N
5/5⭐️
Good
G**.
perfect size and quality
perfect size and quality
S**D
جيد
جيد
S**S
Good
Good
S**D
original and good quality
all good
M**K
Nice thing
Used for washing machine gasket. Does the job well
H**G
Poor product
Arrived almost solid so could not use the nozzle with it. Most of the silicone is not usable.
I**S
Good quality product
I had to rebuild and repair an old 1940s copper diesel tank, the original cork gasket was disintegrated so I used this to make a seal around the hatch and after two months of use it seems to be holding its own. I’d buy again if required.
J**A
Purchased for Aquarium decorations and it works well.
The product arrived as expected and on time. I used this glue to stick a drift wood with a stone for my aquarium decoration. So far, it is holding it well and it is not causing any trouble in my aquarium. Good product.
W**E
Good sealant, use your own applicator.
Used this to seal up an aquarium and it worked super well. It hardened fully in about 48 hours, but I probably could've scraped off the excess after 24. It's super clear and blends into the background. The applicator didn't work very well, so I put it in a Ziploc and piped it on like frosting, which worked much better. Aquarium is watertight now.
H**V
Atención al cliente estupenda, artículo según descripción y envío rápido.
Inmejorable!
G**N
It was the best thing
Was sent on time
Trustpilot
3 weeks ago
1 week ago