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Internet # 306283455

Model # 18220

Store SKU # 1003545321

DYNAFLEX ULTRA 10.1 oz. Black Advanced Exterior Window, Door and Siding Sealant

$9.98
  • Paintable latex flex sealant for exterior and interior use
  • Weatherproof with a lifetime resistance to mold, mildew and algae
  • Maintains flexibility and adhesion and rain ready in 1 hour
  • View More Details

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Product Details

About This Product

DAP Dynaflex Ultra Advanced Sealant for Window, Door, Siding & Trim applications is formulated with innovative Weather Max Technology to resist UV fading, chalking, crumbling, cracking and dirt build up. It also has a lifetime mold, mildew and algae resistance guarantee, so the sealant stays looking clean and new. Dynaflex Ultra has strong adhesion to common building materials and stays permanently flexible for a long-lasting, weatherproof seal that provides All Weather Protection and stands up to the elements. It is rain ready and paintable in one hour for better productivity. Waterproof sealant does not bubble, is low in odor and cleans up easily with water. DAP sealant guns out effortlessly and tools smoothly for easy application. Dynaflex Ultra meets ASTM C920, Class 35, is VOC compliant, and can be used on exterior and interior applications. DAP caulk and sealants provide durable performance for a variety of projects.

Highlights

  • Step-by-Step How to Caulk like a Professional
  • Dynaflex Ultra is powered by Weather Max Technology for long-lasting, all weather protection, making it the perfect exterior sealant for windows, door, siding and trim
  • Dynaflex Ultra is an all purpose sealant in a proprietary synthetic latex formula that creates a 100% waterproof and weatherproof seal
  • Black sealant seals joints up to 1" wide and creates a tough hydrophobic surface that prevents water absorption and resists dirt pick up for a clean looking surface
  • Proprietary synthetic latex sealant is low in odor and cleans up with water
  • Adheres to a wide range of building materials indoors or outdoors, such as wood, MDF, PVC, and composite trimboard; meets ASTM Specification C920, Class 35
  • Dries tack free in 30 minutes, is paint and rain ready in 1 hour, covers 55 linear feet at 3/16" diameter bead
  • 100% waterproof & weatherproof seal guarantees mold, mildew and algae resistance on the cured caulk surface
  • How to use a caulk gun
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 306283455

Model # 18220

Store SKU # 1003545321

Specifications

Individual size (oz.): 10.1 oz

Dimensions

Individual size (oz.)

10.1 oz

Details

Caulk and Sealant Application

Window & Door

Caulk and Sealant Type

Latex

Color/Finish

Black

Dry Color Family

Black

Dry to Touch (min.)

30 min

Features

Moisture Resistant, Mold and Mildew Resistant, Permanently Flexible

Interior/Exterior

Exterior

Number of Tubes Included

1

Paint Tool Product Type

Caulk

Returnable

90-Day

Series

Dynaflex Ultra

Warranty / Certifications

Manufacturer Warranty

See Product Package

Questions & Answers

What is the elasticity rating for this product?
ByAug 11, 2026
1 Answer | 
Answer This Question

Thank you for posting your inquiry on DAP DYNAFLEX ULTRA. DAP DYNAFLEX ULTRA meets (ASTM C920, Class 35), with 35% +/- Dynamic Joint Movement. Should you have any additional questions or require further assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.

By|Aug 11, 2026


    Will this work between kitchen stainless sink and granite countertop
    ByJul 30, 2026
    1 Answer | 
    Answer This Question

    Thank you for posting your inquiry on DAP DYNAFLEX ULTRA. DYNAFLEX ULTRA is designed, tested, labeled and marketed for use as a trim and molding sealant, it is not designed, tested, labeled, marketed or recommended for use as a kitchen and bath sealant. While it will adhere to both stainless steel and granite, we would recommend instead our DAP KWIK SEAL PLUS, 100% Silicone Kitchen and Bath Sealant or our AMP Advanced Kitchen Bath and Plumbing Sealant for the application as described. Should you have any additional questions, please feel free to reach out to DAP’s Technical Customer Service Department at 888-327-8477.

    By|Jul 30, 2026


      Will this caulk stick to glass?
      ByJul 22, 2026
      1 Answer | 
      Answer This Question

      Thank you for posting your inquiry on DAP DYNAFLEX ULTRA. As indicated on the product package label and supporting product literature:" ADHERES TO: Wood – painted & unpainted, aluminum, most metals, vinyl, most plastics, plaster, drywall, glass". Should you have any additional questions or require further assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.

      By|Jul 23, 2026


        Can this be using for caulking in the shower?
        ByJul 4, 2026
        1 Answer | 
        Answer This Question

        Thank you for posting your inquiry on DAP DYNAFLEX ULTRA. DAP DYNAFLEX ULTRA is designed, tested, labeled, and marketed for use as a window, door, siding, trim, and molding sealant. It is not designed, tested, labeled, marketed, or recommended for use as a kitchen and bath sealant. For kitchen and bath applications, we would recommend the use of more specialized kitchen and bath products, such as: KWIK SEAL ULTRA, AMP Advanced Modified Polymer Waterproof Kitchen, Bath and Plumbing Sealant or Silicone Max 100% Premium Kitchen and Bath Silicone Sealant. Should you have any additional questions or require further assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.

        By|Jul 5, 2026


          what caulking is the same as russet vinly side
          ByJun 24, 2026
          1 Answer | 
          Answer This Question

          Thank you for your inquiry regarding DAP DYNAFLEX ULTRA. Please note that this product is not available in the color "Russet." For this specific color requirement, we recommend considering our DAP DYNAFLEX 920 sealant. Should you have any further questions, please feel free to contact DAP’s Technical Customer Service Department at 888-327-8477.

          By|Jun 24, 2026


            can this be used on the exterior trim on your rv
            ByJun 15, 2026
            1 Answer | 
            Answer This Question

            Thank you for posting your inquiry on DAP DYNAFLEX ULTRA. DAP DYNAFLEX ULTRA is designed, tested, marketed, labeled, and recommended for use in residential construction applications. DAP DYNAFLEX ULTRA is not designed, tested, marketed, labeled or recommended for use in transportation applications (marine, automotive, etc.). For most automotive applications, we would recommend the use of DAP Auto/Marine 100% RTV Silicone Sealant, DAP Item Number 7079800694. Should you have any additional questions, wish to discuss our recommendation or your project in more detail, please feel free to contact DAP’s Technical Customer Service Department at 888-327-8477.

            By|Jun 15, 2026


              Can it be used to caulk interior concrete corner cracks
              ByJun 6, 2026
              1 Answer | 
              Answer This Question

              Thank you for posting your inquiry on DAP DYNAFLEX ULTRA. While DYNAFLEX ULTRA will adhere to concrete, it is not recommended for use in filling surface defects. As indicated on the product package label and supporting product literature: "Not for continuous underwater use, high temperature surfaces or surface defects." Should you have any questions or require further assistance, please feel free to contact DAP’s Technical Customer Service Department at 888-327-8477.

              By|Jul 29, 2026

                (1)

                Does dirt and debris, from the outdoors, stick to this caulk? Trying to find one that isn't "sticky" as most leave the caulking area filthy.
                ByJun 4, 2026
                1 Answer | 
                Answer This Question

                Thank you for posting your inquiry on DAP DYNAFLEX ULTRA. The issue that you describe, "dirt pick-up", is typically associated with high performance sealants. Sealants with high elasticity will generally have a softer/tackier feel, which can result in the issue that you are concerned with. With that said, “dirt pick-up” is generally related less this the sealant’s intrinsic performance, and more as a result of environmental exposure. Should you have any additional questions or require further assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.

                By|Jun 4, 2026


                  Viewing 1-8 of 301

                  Customer Reviews

                  4.4 out of 5

                  • 4.4 out of 5,349 reviews
                  • 77% recommend this product
                  Filter by:
                  Showing 1-10 of 5,349 reviews
                  Purchased for a small repair underneath my bay window. The bright white matched the flashing perfectly and left a clean look.
                  by
                  This is an excellent sealant and it looks to be very long lasting.
                  by
                  It has been 7 days of drying and it is still white. It’s suppose to be clear??
                  by
                  Response from DAPProductExpertMay 22, 2026
                  Thank you for posting your feedback on DAP DYNAFLEX ULTRA. As indicated on the product package label and supporting product literature (in BOLD text): "sealant applies white and dries clear in 7-14 days (depending on joint depth, temperature and humidity). All of DAP's (CLEAR) acrylic-latex (water-based) sealants will function this way and are labeled accordingly with the information found above, regarding this color changing performance characteristic. Should you have any additional questions or wish to discuss this, please contact DAP’s Technical Customer Service Department at 888-327-8477. DAP
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  With black frame windows, this was excellent to reseal cracks from original white caulk used. Went on easy and looks amazing after cures. Expect no more cracking with season changes.
                  by
                  Easy to use. Dark gray, not really black. Water based product is much more convenient than silicone; easier cleanup.
                  by
                  • Verified Purchase
                  I had order 3 cases. I was short 4 cubes of caulking.
                  by
                  Response from DAPProductExpertMar 13, 2026
                  The online questions & reviews platform is designed and intended to allow Customers to post questions and provide feedback regarding manufacturer's products, not transactional feedback. Shipping/order fulfillment issues should be reported directly to the shipping carrier and/or the Retailer (online or in-store), not posted as an online review. For further assistance, please contact the contact The Home Depot Customer Service Department at 800-430-3376 any day between 6 a.m. and 2 p.m. EST. DAP
                  • Verified Purchase
                  1 found this review helpful
                  I purchased this caulk to seal in a new shower door install. Works great, doesn't run when applied correctly.
                  by
                  • Verified Purchase
                  The color is a little lighter than pressure treated two by fours, but about the same color as cedar planks. Not quite as red, though. There are a lot of knots. Very easy to screw in. No problems with splitting.
                  by
                  It's very easy to apply and it's not very thick . It's also very easy to tool . I am satisfied with the caulk , one thing though if you are working on winter , it's not one of best temperature rating . Our Chimney was damaged , so we replaced it with hardie plank and corner with PVC trim , the caulk is perfect and it's holding good. Another thing if you have bigger gap , you have to use some excess caulk , otherwise when it dries you will find it has gone inside and not fully covered
                  by
                  Showing 1-10 of 5,349 reviews