Customer Reviews for DAP DYNAFLEX Ultra 10.1 oz. White Advanced Exterior Window, Door, and Siding Sealant

I applied this all around my year-old window where it meets the exterior stucco frame, but when it rained the next day water poured down the top of the window below it. Two days later, a leak specialist pointed out gaps -- as if I had never caulked the window at all because the so-called sealant had shrunk. This is despite one of the product pictures saying: "Early 1 hour rain resistance without the sealant washing out or getting damaged with permanent rain marks." Home Depot gave me a full refund, but this product should be pulled from shelves for making false claims.

We caulked some expensive door trim with this and it will not hold paint. I thought my guys grabed silicone to caulk with because the result is almost identical. It seems like a very good caulk but if you have to paint it, forget it.

18 hours to cure and then failed miserably. Significant flooding in some areas while the product worked in others. Yet there was no variance in the structure.

I snagged this sealant specifically for my DIY prehung door install. Applying it was a breeze, even for a non-pro like me, and it sealed up those gaps around the frame like a charm. Definitely gets the job done. Two thumbs up from this happy homeowner!

Four days after it has not fully dried yet. And that’s outside at about 85 grades Fahrenheit. Let alone in the inside where it is almost as it came out of the tube. This is the crappiest product I’ve ever used.

Do not buy this item. It's guarantees that there will be no mold algae or mildew for a lifetime. In this case a lifetime is 3 months.

I used this on a dog house that I participated in carpentry finishing work. It created the depth I was hoping for on the dog house and added to the flesh seal sealant I painted on the wood!

Goes on white and dries clear...NO. I applied this stuff between my patio room aluminum and adjourning deck board. 1/8"-1/4" gap in a 16' seam. Label said raintight in 3 hours. Well, it rained 8 hours later, and the stuff actually ran all over my deck board, bled down to the level below staining my paver blocks white. None if it ever turned clear after 2 weeks. Very disappointed in this product. Don't quite know how I'm going to fix this or remove the staining on areas it ran to.

I needed to fill gaps in a "lending library" box I built to ensure moisture did not get inside the structure. Application was easy and did the job. It also blended well with the recycled cedar fence boards used in the project.

Tube marked clear but chalking is white

best caulk out there for windows. Great adhesion and did not shrink so only needed one application even on gaps greater than 1/4". Will definitely be using again for other window and door projects.

Best caulk there is.

I've used all kinds of silicones over the years when a product says tact time 30 minutes I expect it at maybe 70°. The tax time on this was beyond three days when I applied it it was 70° for nearly 6 hours more than enough time for it to tack up good 48 hours later and it was still as wet as I put it on it did not start packing until at least 72 hours later. And the mess that it made is ridiculous I will never purchase this product ever again.

I saw that this was popular with a majority of positive reviews. Unfortunately disappointed. I needed a clear silicone for a cold frame with polyurethane double wall windows. I bought a few tubes “clearly” marked CLEAR but it is WHITE. Why would DAP advertise as clear? It also has been two days, no rain, but the caulk is still not totally dry. I’ve had much better luck with other DAP caulks. I cannot recommend it.

I worked extremely hard preparing to paint my house 2 years ago. I caulked every single seam on the exterior of my house. Now the expensive paint that I used has come off of the caulk and the caulk is shrinking and peeling away. In most places it doesn't even look like I applied caulk to my house. I am now going to have to go back and recaulk the entire house and repaint.

Excellent adhesion, fast curing and expansion, I know its not good for deck joints but I used it on a composite deck that has a very low expansion ratio and worked marvelous, yet to see durability under humidity (summer) and frozen temperatures (winter) but so far its working great

I'll never know if it's good because it was already dry and opaque in the tube and barely flowed out afger cutting the tip. Supposed to be clear, but this batch came out as a pasty white almost crumbly clay.

‘1 Hour Paint Ready, 2 Hour Rain Ready.’ I applied this product in accordance with the instructions. I placed one section of caulk 2 days ago, it rained lightly today, and this caulk ran from the rain. I should have believed the reviewers.

It's better then sliced bread!

Used on metal to wood. Started at 2PM and was done by 8PM. 10AM next day it rained a bit. Now, over 13hrs later, I have black streaks on the wall. Caulk is wet(not just water} to the touch, As of I just applied it 30min ago. Is NOT rain ready in an hour!

I caulked a penetration where HVAC lines left my house. The caulk came out white, I put most of the tube in. Everything was within the application specs on the side. It rained about four hours after I put the caulk on, it claims to be rain-fast in two hours. I came back the next day to screw the shroud back on, and saw the caulk had completely run, leaving huge gaps. It was still as wet as it came out of the tube. Even the left overs on the outside of the tube, which were in a dry basement, were still wet/tacky. I double checked I bought clear, it was still completely white. As you can see in the image, even after squeezing the caulk thin, it is white. Last time I save money and settle for a DAP product for $1 less.

I purchased this product from Home Depot as I wanted to compare this improved version of Dynaflex against my usual go-to caulk/sealant, which is DAP Dynaflex 230. This particular project involved sealing the perimeter slab concrete flooring of my unfinished basement and the perimeter of the flooring slab in my attached garage. There were also some touch-up places that needed resealing on my vinyl siding where there are penetrations by pipes and electrical wiring. I think it's a big selling point for this product, to come in at least 10 different colors - which are color matched to various manufacturers colored building products. Normally, Dynaflex 230 would be my top pick - but the newer Ultra variety seems to claim it is better at standing up to the elements. Let's see what we found: PACKAGING: Standard 10.1oz caulk tube. There is no inner foil seal to pierce once you cut the end off of the tube. This is a plus if you want to run a very fine bead of the product. MADE IN / ASSEMBLED IN: This product is made in the USA (primarily in Maryland) with US and globally sourced materials. QUALITY: This product is of outstanding quality and has a lot of features that are desirable, especially for those using it on exterior projects. It resists UV fading (unlike most clear silicone sealants) and dirt build-up (unlike almost all silicone sealants), claims to be crack-proof, claims mold/mildew/algae resistance, is 1hr rain and paint ready, can be used on both interior and exterior projects (which is a plus and true due to the very low to no VOC release), adheres to a wide variety of substrates, and claims a 35% joint movement tolerance. MAINTENANCE: No special maintenance is required. Cured sealant handles light washing very well. TEST RESULTS: Overall, this is the quality I have come to expect from the Dynaflex line of products. When it comes to tooling the product, the Dynaflex 230 is far easier to tool than the Ultra. The 7-14 day cure time seems excessive for a water-based product, however it is true that it takes this long for it to fully harden and provide that 'hardened shell' feel. I've always taken exception to the 1hr paint-ready claim. Why would you want to paint a product after an hour that takes 7-14 days to cure? I'd rather wait until it's cured to paint it - if possible. The Ultra will not cover gaps as wide as the Dynaflex 230 will. This Ultra is not meant for gaps wider that 1/2 inch by 1/2 inch wide/deep. You'll need to use backer rod if you're caulking anything deeper. So both the 230 and the Ultra are great products. I must say, that for exterior applications - the Ultra is the better product. The 230 is a close second but certainly a better choice for use as a painter's caulk - which is what I primarily use it for.

So much for “no cracking”!!! Spent days working faux wood design only for this product to ruin it all. Cracks and shrinks....

Rating provided by a verified purchaser

Had a rotted step at the bottom of the sliding door to our deck. Found out it rotted the step, the lowest siding board, bottom of 4 vertical trim boards, and two deck boards. After everything was replaced, I used a couple tubes of DAP sealant. Has to be paintable(not done yet!), clear, and flexible since Colorado weather is rough on wood. Everything is waterproof after the couple inches of snow we had so far. I'll be painting the back door this spring, so will have to update how the sealant accepts the paint.

This was a fresh, new tube I purchased just a few weeks back from HD. When I opened the tube and began using it, instead of caulk, I got a big puddle of clear watery goop, with chunks of caulk in it. After cleaning up that mess, I squeezed out a few more tablespoons of that goop until I reached “real” caulk; but even that was lumpy and inconsistent, and wouldn’t make a smooth bead. Attached is a photo of the clear goopy mess on a piece of scrap. Very disappointing, DAP.

I used this to install a weather seat in the trunk of an old car I’m restoring. It’s a little thin and runny but I got used to applying it. Sealed perfectly and no more water leaks!

The color is off, it’s more of a charcoal black not the color of the tip as expected.

I bought this product to seal the out sode edge of my pond liner and it wont set. Its been 2 days now. Im going to clean it off. What a mess!

I bought this to caulk around a new window inside and out because it is paintable. All surfaces were cleaned before the caulk was applied and two days after it was applied I painted around the inside with latex paint. I found the paint was "dragging" the caulk making little balls in the paint. Its WeatherMax Technology claims to resist dirt build up, but after two days I can see dirt building up on it. It may be difficult to see in the attached picture, but it is there. I would not be surprised at all that in a short time I will be scraping it off on the outside and redoing it with silicone.