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💧 Seal smarter, not harder — the last caulk you’ll ever need!
Flex Caulk Hybrid Polymer Waterproof Sealant is a 3 oz clear, paintable sealant designed for professional-grade waterproofing and adhesion. Featuring a no-gun-needed adjustable trigger flow nozzle, it delivers precise application on wet or dry surfaces. Its advanced hybrid polymer formula ensures a durable, flexible seal that resists shrinking, cracking, UV, and chemicals, making it ideal for kitchens, baths, windows, and RVs. Fully paintable and equipped with a waste-reducing Snap & Save cap, it combines convenience with long-lasting performance.
| ASIN | B0DK9X348H |
| Best Sellers Rank | #159 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Adhesive Caulk |
| Brand | Flex Seal |
| Brand Name | Flex Seal |
| Color | Clear |
| Customer Reviews | 4.2 out of 5 stars 92 Reviews |
| Full Cure Time | 4 hours |
| Included Components | Flex Caulk, Clear, 3 oz, 1-Pack |
| Item Form | Liquid |
| Item Highlight | No caulk gun needed, trigger flow nozzle, paintable, won't shrink or crack, seals wet or dry, bath, kitchen, sink, window, RV |
| Liquid Volume | 3 fluid ounces |
| Manufacturer | Swift Response, LLC |
| Material Type | Hybrid Polymer |
| Model | CFSCLRR100 |
| Number of Items | 1 |
| Part Number | CFSCLRR100 |
| Surface Recommendation | Tile |
| Tensile Strength | 400 psi |
| UPC | 810129870770 |
| Unit Count | 3 Fluid Ounces |
| Water Resistance Level | Waterproof |
S**Z
So easy
This waterproof caulk is very easy to use, spreads a bead from a dial at the top of the tub. It has a surprisingly affordable price for just a 3 oz. Tube. The sealant comes out clear, is very flexible & stays clear/flexible after completely dry. Once you put a bead down, you use a wet finger to smooth it out, adhering all the way around. It takes 24 hours, preferably 48 hours to cure before it is considered completely waterproof. Can be successfully used to fill in gaps then smooth out the outer edges and let cure before getting wet.
A**N
Exactly what I needed
Late review for honest review - This stuff is great! Already fixed a few horse tubs, bird bath and shows zero leakage, excellent purchase. It’s clear as it dries. Durable and saved a lot of things from the trash!
M**Y
Application was easy.
Appears to be as advertised. Application on gutters was easy. I will have to wait until it rains to see how it holds.
L**G
This works
This worked and did what it needed to do and my apartment there was this hole by the bathtub where roaches would come and I put this on the hole and I have not seen roaches ever since so I'm glad that I bought this and plus buying this saves me from having to have the maintenance man come in I don't like to have maintenance come in when I don't have to
M**Z
Not usable. Wouldn't come out of tube. Dried up.
Not functional, dried up.
B**Y
Worth It
Husband loved how easy it was to apply. Seems to be working great too.
M**S
Just Works
Exactly as expected, excellent product
M**.
Cost is good
Easy to apply
Trustpilot
4 days ago
2 months ago