I had an old stock tank I wanted to turn into a water container garden, but it had some small leaks around the base. I used this sealant on the inside of the tank and the outside around the seams, and let it dry for about a week. Then I got impatient and filled it with water anyway (it said it could take a couple of weeks to dry completely). When I filled it up the leaks were much better, and it could hold water almost completely, but still leaked a little bit. I figured it wasn't that big of a deal and I would need to do periodic water changes anyway, so I left it at that. The biggest surprise came like a week later when this stuff finished drying (while holding water) and now it doesn't leak at all! THIS STUFF IS MAGIC!
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Response from DAPProductExpertSeptember 9, 2020
Thank you for posting your feedback. While we are happy to see your positive comments, we must note that DAP DYNAFLEX 230 is not designed, tested, labeled or recommended for use in submerged (below waterline) applications. As indicated on the product package label and supporting product literature: "Not for continuous underwater use...". Should you have any additional questions or require further assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.
I recently stripped and scraped 50 years worth of old white caulk from the wood trim around my front door where the trim abuts to brick. After removing the old caulk, the contrast between the brick and dark newly-painted trim looked really good - but there was an air gap. Filling with white caulk would not have looked good, so I tried the clear variety of this product. The result was very satisfying. The photos show the result and what the trim to brick transition looked like "before". Note that the clear caulk goes on white, but after several days it turns clear as it cures. Don't forget to fill wider gaps with foam backer as the instructions suggest.
100% Water proof unless you get it wet. DAP = "Don't Apply Period" It NEVER cured and now it's a...
November 8, 2018
100% Water proof unless you get it wet. DAP = "Don't Apply Period"
It NEVER cured and now it's all over a brand new $25,000 deck. Calling them was no help. All I can do now is scrape and scrub and hope I don't destroy the deck or the house. This stuff is JUNK!
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Response from DAPProductExpertNovember 9, 2018
Thank you for posting your feedback. We're sorry to hear about your experience with DAP DYNAFLEX 230. Because you did not indicate the size of the joint, application surfaces, surface preparation, application technique or application conditions, it is difficult to provide a proper response. DYNAFLEX 230 is a water-based formula, as such, the sole drying mechanism is the evaporation of water. Dry time can be significantly impacted by cool or humid application conditions, moisture in the application surfaces or by thick (deep) applications of the sealant. When more challenging applications are present, DAP would recommend that you consider our line of fast cure sealants, such as DAP 3.0 Window, Door, Trim & Siding High Performance Sealant. The fast cure sealants will be surface dry and ready for paint in approximately 30 minutes, even in cooler and/or more humid application conditions. Should you require additional assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.
When you're buying caulk, you should be aware that, just like paint, the price is going to indicate the quality.
In the caulk family, the cheapest caulk is PAINTER'S CAULK. Painter's caulk (called Dap brand Alex Painters Caulk at Home Depot) is low quality and will crack and fail within a short period of time. Painters will use painters caulk to save money. DON'T LET THEM.
The next price point up is PAINTER'S CAULK WITH SILICONE (The main brand that Home Depot sells is called Dap Alex Plus). This is a better choice than plain painters caulk because it is made from acrylic, a more flexible glue that is the primary ingredient. They also add a very SMALL amount of silicone to further prevent cracking. While this is a good choice, but you can still do better. Read on.
The next price point up is ELASTOMERIC CAULK. (The main brand Home Depot sells is called Dap Dynaflex 230). Elastomeric caulk is far superior than the previous 2 mentioned. It is flexible up to 50% of it's size and can be painted. It lasts YEARS. Home Depot sells it in a wide variety of colors. When I have contractors doing work on my house for me, I ALWAYS insist that they use Dynaflex 230 Elastomeric Caulk. It may cost $1-$2 more, but it is WORTH IT. In the 2 pictures I submitted, this is a large piece of Dynaflex 230 that was removed from a patio door that was changed out. It was on there for about 2 months. In the first picture noticed how much it will stretch without breaking. I could have stretched it even further (like gum, but stronger), but it was too difficult to stretch it and hold my camera and push the button at the same time! In the second picture, I have twisted it to show the flexibility. The twist is to the left of the piece.
Take note that other retailers sell this product also, so it is widely available.
This is a great caulk I actually used it around my laminate stair treads I just did, however I wish they had a darker gray too. it worked nicer than a bright white. the 1st coat sank a little and had to go back and do a 2nd coat as well. No big deal. I would recommend and will buy again. I like dap products.