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  • 3 VIDEOS
  • Dicor 551LSW-1 HAPS-Free NON-Leveling Lap Sealant - 10.3 Oz, White, Secure, Ideal for RV Roofing, Maintenance, Repair, Appliance Application
  • The Leader in RV Industry Roof Products, Sealants,& CoatingsDicor

Dicor 551LSW-1 HAPS-Free NON-Leveling Lap Sealant - 10.3 Oz, White, Secure, Ideal for RV Roofing, Maintenance, Repair, Appliance Application

4.7 out of 5 stars (23,628)
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Color: White
Size: Non-Leveling

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About this item

  • USE: This sealant helps create a watertight seal along a roof's edge, air vents, vent pipes, and screw heads
  • COLOR: White hue for stylish and beautiful RV roof
  • COMPATIBILITY: Formulated for EPDM roofing but also compatible with most other roofing material, including Dicor DiFlex II, Tufflex, PVC, and PriTEK TPO roofing
  • LONG LASTING: sun-ray stabilized to avoid discoloration and spoiling and will not stain or discolor any material to which it is applied
  • FEATURES: Offers excellent adhesion to aluminum, mortar, wood, vinyl, galvanized metal, and concrete; Continuously seals and remains flexible

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This item: Dicor 551LSW-1 HAPS-Free NON-Leveling Lap Sealant - 10.3 Oz, White, Secure, Ideal for RV Roofing, Maintenance, Repair, Appliance Application
$10.00 ($0.97/fluid ounce)
Get it as soon as Thursday, Jun 11
In Stock
Ships from and sold by Amazon.com.
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$61.00 ($0.99/fluid ounce)
Get it Jun 10 - 12
In Stock
Ships from and sold by RV Wholesale Direct LLC.
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Lap sealant
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White Roof Lap Sealant Non-Leveling
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Dicor 551LSW-1 HAPS-Free NON-Leveling Lap Sealant - 10.3 Oz, White, Secure, Ideal for RV Roofing, Maintenance, Repair, Appliance Application


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Product Description

Dicor Corporation Part #551LSW Non-Sag White Lap SealantbrbrHelps create watertight seal along a roofs edges#44; air vents#44; vent pipes and screw heads. Dicor Products Lap Sealant is a versatile sealant formulated for EPDM roofing but also compatible with most other roofing material#44; including Dicor DiFlex IItrade; and BriTEKtrade; TPO roofing. It offers excellent adhesion to aluminum#44; mortar#44; wood#44; vinyl#44; galvanized metal and concrete. Package Quantity = 1

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What's in the box

  • Dicor Corporation 551Lsw-12 Edpm Lap Seal 10.3 Oz. Tube Wht
  • Customer reviews

    4.7 out of 5 stars
    23,628 global ratings

    Customers say

    Customers find the sealant effective, particularly noting its performance on EPDM and TPO roofing repairs, and appreciate its self-leveling properties, with one mentioning it fills holes and cracks well. The product is easy to use, applies smoothly and evenly, and customers consider it a high-quality product. While some customers report it stops leaks effectively, others mention issues with the product leaking out. The durability receives mixed feedback, with some noting it doesn't crack over time while others report broken plastic nozzles, and opinions on value are divided between those who find it good value and those who consider it expensive.
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    730 customers mention effectiveness, 706 positive, 24 negative
    Customers find the sealant effective, working well on various surfaces including motorhomes and vertical ones. One customer specifically mentions its success with EPDM and TPO roofing repairs.
    ...I am impressed. It works great....Read more
    It works well but you would think that being the most expensive caulking on the market that they could put it in a better quality tube that could be...Read more
    Very easy to use and worked great! We had a leak on the roof of our popup, Thai stuff worked great to fill and seal. Would highly recommendRead more
    Help seal a screw hole in by RV roof. Works as advertised. Just wear vinyl gloves. It can be messy.Read more
    708 customers mention quality, 672 positive, 36 negative
    Customers praise the sealant's quality, describing it as the best caulk and sealant available.
    Great product, it was only a dollar cheaper here than it was from the RV center, but I had to order the replacement Plumbing Vent kits anyways, so...Read more
    It's probably a good product but it arrived with the nozzle bent. Now I'm having a hard time applying it with the nozzle going all over the place.Read more
    This might be good stuff, but DON'T BUY IT if you're using it on any vertical surface - description doesn't mention it is for HORIZONTAL SURFACES onlyRead more
    Great stuff! Works exactly as advertised. I used it to seal the new Winegard TV antenna I installed on our camper and this stuff worked great....Read more
    235 customers mention self-leveling, 197 positive, 38 negative
    Customers appreciate the sealant's self-leveling properties, noting that it starts leveling immediately and completes the process overnight, effectively filling holes and cracks.
    Have used this for a long time, seals great to your EPDM roof. Self Leveling, great adhesion. Use around all your vents, plumbing penetrations, etc..Read more
    ...This is the real Dicor brand - self-leveling and it matches perfectly what I removed in the repair process. I couldn't be happier.Read more
    It self levels and you can put to much but it will not leak was able to do this max air fan and have just a little left over just using one...Read more
    Sealed my Rv seams and it’s super easy and levels out nicely. Great product, will definitely use again.Read more
    204 customers mention ease of use, 190 positive, 14 negative
    Customers find the sealant easy to use, particularly for sealing roofs, with one customer noting it works well on mostly level surfaces.
    works as described, easy to use spoke to the company about cleaning the area on the RV that needed prepare and they suggested a little Dawn and water...Read more
    Very easy to use. You can practically watch it level out and seal any devices/surfaces on the camper roof. See no signs of leaking or deterioration....Read more
    It's white and self-leveling and easy to work with and seems soft enough that I hope it does not crack overtime. It sticks very easilyRead more
    ...let first bead settle some then add more. great stuff. easy to work withRead more
    177 customers mention application, 161 positive, 16 negative
    Customers find the sealant easy to apply, noting that it goes on smoothly and evenly, though it starts to set up quickly.
    Best sealant to use on rv roof. Easy to apply and has excellent self leveling properties when applied following the directions on the tube.Read more
    It applies easily and seems to flow into whatever gaps or crevices there may be but I haven't found any....Read more
    as described, as delivered, easy application.Read more
    Very easy to apply. My wife and I used if to install a Maxx Air fan in our RV, very easy to apply!...Read more
    296 customers mention durability, 128 positive, 168 negative
    Customers have mixed experiences with the sealant's durability, with some reporting that it seals cracks well and doesn't crack over time, while others mention issues with the tube breaking open around the cone and the nozzle dispenser failing.
    The product arrived with a broken tip. The product is now unusable for the use intended.. I would like a replacement if possible.?Read more
    Very good quality and durable. It’s easy to apply but could be a nuisance. If you don’t know what you’re doing....Read more
    Was damaged like it was run overRead more
    I am satisfied with the results in adhesion and durability associated with this product. I plan to purchase again in the future.Read more
    183 customers mention leakage, 127 positive, 56 negative
    Customers have mixed experiences with the sealant: some report it effectively stops leaks and seals RV roofs, while others mention it oozes out of the tube.
    ...I am now going into my second winter and still no leaks. I am impressed. It works great....Read more
    Stops leaks and fills cracks on the roof of your camper. Seals around skylights, air conditioner and more.Read more
    ...This one arrived with the tip bent and leaking. I was told there was no refund/replacement....Read more
    Use to seal a/c and vents on top of my rv. Self leveling and no more leaks.Read more
    144 customers mention value for money, 90 positive, 54 negative
    Customers have mixed opinions about the sealant's value for money, with some finding it a good value while others consider it expensive and a waste of money.
    just like the stuff you buy at any RV store. good price and fast delivery. works fine. one of the easiest projects i have ever done....Read more
    ...out while I was using them making them worthless, messy, and a waste of money!Read more
    Great price and quick delivery. the local RV stores wanted 30% more so it was worth the shipping by far...and is the same brand and quality...Read more
    Great valueRead more
    Works well on trailer roofs
    5 out of 5 stars
    Works well on trailer roofs
    This is a good product. We have a lot of client's in a vacation park. Their park model trailers take a beating all winter and then get cooked in the sun all summer. This is the best sealant I've found for tpo and rubber roof that trailers have. It is easy to apply and makes a nice solid patch.
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    Top reviews from the United States

    • 5 out of 5 stars
      Works well on trailer roofs
      Reviewed in the United States on April 15, 2026
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      This is a good product. We have a lot of client's in a vacation park. Their park model trailers take a beating all winter and then get cooked in the sun all summer. This is the best sealant I've found for tpo and rubber roof that trailers have. It is easy to apply and makes a nice solid patch.

      Works well on trailer roofs
      Works well on trailer roofs
      5 out of 5 stars
      Works well on trailer roofs
      Reviewed in the United States on April 15, 2026

      This is a good product. We have a lot of client's in a vacation park. Their park model trailers take a beating all winter and then get cooked in the sun all summer. This is the best sealant I've found for tpo and rubber roof that trailers have. It is easy to apply and makes a nice solid patch.

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    • 5 out of 5 stars
      The Only Lap Sealant I Use!
      Reviewed in the United States on April 22, 2026
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      I have tried a couple of other brands of lap sealant, and the results were simply not good. I recently installed an additional solar panel on my RV. I used a cheaper brand to save a few dollars, huge mistake! So, I decided to order Dicor and used it to finish the project and cover the other brand. The Dicor flows smoothly, it adheres great and the leveling is superb. It makes the project looks so much more professional, and I trust that it will do its job to seal and protect from leaks, etc. No more trying other brands, Dicor is the only lap sealant I will use in the future.

      2 people found this helpful
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    • 5 out of 5 stars
      Works as it should
      Reviewed in the United States on June 2, 2026
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      Item as described, good quality, works good.

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    • 4 out of 5 stars
      Great Product
      Reviewed in the United States on May 19, 2026
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      Product works great, Very easy to use and makes it possible to maintain your rv roof, I would say it’s definitely the brand to buy, I do think the tube could be constructed a little better as one of mine started leaking from the top as I was using it, Still got the job done and the product itself is great

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    • 5 out of 5 stars
      Great product
      Reviewed in the United States on March 27, 2026
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      Works excellent for rv roof. Levels nicely and creates a flexible water tight seal perfect for covering screws and going around objects like the antenna and satellite or anything else that would make using sealing tape a pain in the rear. Have used it many times and will continue to use it when needed.

      One person found this helpful
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    • 5 out of 5 stars
      Dicor is excellent.
      Reviewed in the United States on May 9, 2026
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      Excellent product. Works as it should.

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    • 5 out of 5 stars
      Worked perfectly on my camper roof!
      Reviewed in the United States on May 2, 2026
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      I bought this Dicor Self-Leveling Lap Sealant to do some maintenance on my 2021 Shasta 25RB, and it worked absolutely great. It is incredibly easy to apply with a standard caulking gun and flows smoothly to completely seal the seams.

      The sealant sets up very well and dries to a durable, waterproof finish that gives me total peace of mind against leaks. If you need to reseal the vents or edges on your RV, I highly recommend keeping a tube of this handy!

      One person found this helpful
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    • 5 out of 5 stars
      RV Roof Sealant That Self-Levels and Stays Flexible
      Reviewed in the United States on April 18, 2026
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      RV Roof Sealant That Self-Levels and Stays Flexible

      Used this Dicor sealant on my RV roof edges and around vents—self-levels smoothly with no tooling needed. HAPS-free formula is pleasant to work with, and it skins over in about 5 minutes. After a year of desert sun and monsoon rains, it remains flexible and watertight with no cracking or discoloration. Only note: keep mineral spirits handy for cleanup, and remember it's for horizontal surfaces only.

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    Top reviews from other countries

    • 5 out of 5 stars
      Buy lots! Works great and you’re going to want 2 tubes
      Reviewed in Canada on August 13, 2019
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      Great product and smooths out nice and flat. When they say self levelling they mean it. Don’t try to use on anything vertical. Used with dicor roof repair tape and then redid as many things on the roof that I could with what I had left, wish I had bought a other tube. I’ve heard mixed thoughts on removing old sealant before applying new vs just cover the old stuff. Well my old stuff was in good shape except the expected weather checking and cracks so I just went over the old stuff to maintain water integrity. It went over the old just fine and adhered well so far as I can tell. It smoothed the sealant our like new and removed the water traps. If I had a leak I would probably remove the old sealant and start from new but for touch ups, like I said, buy lots!

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    • 5 out of 5 stars
      Works great and worth every penny!
      Reviewed in Canada on October 24, 2025
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      Dicor self-leveling caulk is fantastic and very easy to use. I own a 40’ diesel pusher, and it cost me around $200 to redo all the caulking. I probably could have done it for less, but I didn’t want to be stingy with the amount I used. I’m glad I didn’t — now I have peace of mind knowing my roof is sealed up and protected for years to come.

      The self-leveling feature makes the finish look smooth and professional, even if you’re not an expert. If you’ve been neglecting your RV roof, this product is an absolute must. Well worth the investment!

      A tip for newbies, cut the tip on an angle but close to the tube (the thick part). You will be laying the caulk on thick and don’t need a fine line as you would with a normal caulking job.

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    • 5 out of 5 stars
      Works as expected
      Reviewed in Canada on February 9, 2026
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      Easy to work with.

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    • 5 out of 5 stars
      Great product
      Reviewed in Canada on November 1, 2019
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      As advertised.

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    • 5 out of 5 stars
      Awesome Product!
      Reviewed in Canada on July 17, 2025
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      This self levelling lap sealant is amazing! I used it to attach my Maxxair fan onto my EPDM roof on my tiny home and I have no fear of leakage. It has lasted through snow/rain/ ice storms, extreme heat/ cold temperatures. I am very impressed.

      Installation is super easy, just watch a quick YouTube and you'll be good to go! Highly recommend.

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    Product Summary: Dicor 551LSW-1 HAPS-Free NON-Leveling Lap Sealant - 10.3 Oz, White, Secure, Ideal for RV Roofing, Maintenance, Repair, Appliance Application

    From Dicor

    4.7 out of 5 stars, 23,628 ratings

    Customer reviews

    900+ bought in past week

    Price

    No featured offers available

    Other sellers

    Other sellers

    About this Item

    • USE: This sealant helps create a watertight seal along a roof's edge, air vents, vent pipes, and screw heads
    • COLOR: White hue for stylish and beautiful RV roof
    • COMPATIBILITY: Formulated for EPDM roofing but also compatible with most other roofing material, including Dicor DiFlex II, Tufflex, PVC, and PriTEK TPO roofing
    • LONG LASTING: sun-ray stabilized to avoid discoloration and spoiling and will not stain or discolor any material to which it is applied
    • FEATURES: Offers excellent adhesion to aluminum, mortar, wood, vinyl, galvanized metal, and concrete; Continuously seals and remains flexible

    Product Description

    Dicor Corporation Part #551LSW Non-Sag White Lap SealantbrbrHelps create watertight seal along a roofs edges#44; air vents#44; vent pipes and screw heads. Dicor Products Lap Sealant is a versatile sealant formulated for EPDM roofing but also compatible with most other roofing material#44; including Dicor DiFlex IItrade; and BriTEKtrade; TPO roofing. It offers excellent adhesion to aluminum#44; mortar#44; wood#44; vinyl#44; galvanized metal and concrete. Package Quantity = 1

    Options Available

    Color

    • Black
    • Dove (Bright White)
    • Grey
    • Ivory
    • Tan
    • White
    • שזוף
    • ابيض

    Size

    • Non-Leveling (Pack of 2)
    • Self-Leveling (Pack of 2)
    • Non-Leveling
    • Self-Leveling
    Browse all available options

    Important Information

    Proposition 65 Warning for California Consumers

    WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

    Proposition 65 Warning for California Consumers

    WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    Product Guidance & Documents

    Safety Information (PDF)

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