Flex Caulk, Waterproof & Weatherproof Hybrid Polymer Sealant, Strong, Paintable, Indoor, Outdoor, Bath, Shower, Sink, Window,
4.3 | 4,008 ratings
Price: 19.87
Last update: 01-29-2026
About this item
- So easy to use.
- No caulk gun needed.
- Adjustable Trigger Flow Nozzle.
- Advanced hybrid polymer formulation.
- Snap & Save cap eliminates waste.
- Seals out water, air, and moisture.
- Adheres to virtually any surface, wet or dry.
Product information
Item details
| Brand Name | Flex Seal |
|---|---|
| Manufacturer | Swift Response, LLC |
| UPC | 810129870756 |
| Global Trade Identification Number | 00810129870756 |
| Customer Reviews | 4.34.3 out of 5 stars(3,748) 4.3 out of 5 stars |
| Best Sellers Rank |
|
| ASIN | B0D2F2DCXM |
| Included Components | Flex Caulk, White, 9 oz, 1-Pack |
| Item Height | 1.75 inches |
| Unit Count | 9.0 Fluid Ounces |
Feedback
Flex Caulk, Waterproof & Weatherproof Hybrid Polymer Sealant, Strong, Paintable, Indoor, Outdoor, Bath, Shower, Sink, Window, Baseboards, Door, RV, Roof, Wood, Auto & Marine, White, 9 oz, 1-Pack
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User guide
| Full Cure Time | 24 Hours |
|---|---|
| Surface Recommendation | Window |
Features & Specs
| Water Resistance Level | Waterproof |
|---|
Style
| Color | White |
|---|---|
| Item Form | Liquid |
Measurements
| Item Weight | 255 Grams |
|---|---|
| Liquid Volume | 9 Fluid Ounces |
Additional details
| Material Type | Hybrid Polymer |
|---|
Top reviews from the United States
- JTAbsolutely incredible product 5 Stars!I am no handyman and definitely not good at DIY stuff around the House, but this practical and excellent product gave me the confidence to seal up my Window in my Basement and it worked flawlessly!
I can’t say enough good things about this product!
It’s easy to use and does exactly as the product claims and there was virtually no mess! - George KalantzisGreat product, very easy to use.Bought this product to seal a tub and tub walls. This was one of the easier applications I had to do, loved the built-in caulk gun with thickness selector. Made the job very simple, and the product dried relatively quickly. I would definitely buy this product again for other home projects.
- Barbara WheelerFlex calkIs great product easy to use
- HusseinVery usefulThis caulk is hard and great. It does get cold and freeze a bit in the nozzle, so you have to poke it to get that white stuff out. But when you're using it, it works great. I did, however, need to watch their video to figure out how to use it. But it was kind of complicated at first. It does get sticky and dry quickly. No smell. Very useful to seal little holes in windows
- Robin L. WrightFantasticThis stuff is fantastic. My second time ordering. Easy to use and works as advertised.
- Mel-katWorks great!Bought this for the first time for caulking around the windows and doors. This is the easiest caulking tube to use. You can manage the thickness of the caulk on how fast/slow you apply. It has a tube closure or shut off capability to keep it from drying out. It's easy to get it started for reuse too. I would definitely buy again.
- TryitonceMessy and hard to useconfused about this product. it was Consumer Reports rated their top pick. but I found it hard to use, messy, hard to remove from fingers, and applicator opening was round and hard to get a 45 degree angle as directed. suggest a rethink of applicator design.
- ChefjeffIt works ,no applicator neededDirections are still a little hard to decipher.The cap is hard to remove that the first time I unscrewed everything and use it..flow is good,seals well and resist water infiltration.