Dicor 551LSW-1 HAPS-Free NON-Leveling Lap Sealant - 10.3 Oz, White, Secure, Ideal for RV Roofing, Maintenance, Repair, Appliance Application
Purchase options and add-ons
| Material | Rubber |
| Brand | Dicor |
| Style | Non-Leveling |
| Item Weight | 14.4 ounces |
| Item dimensions L x W x H | 11.25 x 2 x 2 inches |
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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Dicor Products
With a variety of innovative products, Dicor delivers smart ways to make RVs more functional, better-looking and more dependable.
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From the manufacturer
Product information
| Brand Name | Dicor |
|---|---|
| UPC | 677917000661 |
| Unit Count | 10.3 Fluid Ounces |
| Global Trade Identification Number | 00677917000661 |
| Number of Items | 1 |
| Part Number | 551LSW-1 |
| Model | 551LSW1 |
| Item Type Name | Dicor Corporation 551Lsw-12 Edpm Lap Seal 10.3 Oz. Tube Wht |
| Manufacturer | Dicor |
| Included Components | Dicor Corporation 551Lsw-12 Edpm Lap Seal 10.3 Oz. Tube Wht |
| Best Sellers Rank |
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| ASIN | B003YJLIW8 |
| Customer Reviews |
4.7 out of 5 stars |
Feedback
| Water Resistance Level | Waterproof |
|---|---|
| Item Form | Liquid |
| Compatible Material | Rubber, Epdm, Dicor Diflex Ii, Tufflex, Pvc, Pritek Tpo |
| Item Weight | 14.4 ounces |
|---|---|
| Item Dimensions | 11.25 x 2 x 2 inches |
| Style Name | Non-Leveling |
|---|---|
| Color | White |
| Surface Recommendation | Roof |
|---|
| Material Type | Rubber |
|---|
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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Customer reviews
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Reviews with images
Works well on trailer roofs
Top reviews from the United States
- 5 out of 5 stars
Works well on trailer roofs
Reviewed in the United States on April 15, 2026This 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.


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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The Only Lap Sealant I Use!
Reviewed in the United States on April 22, 2026I 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 helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Works as it should
Reviewed in the United States on June 2, 2026Item as described, good quality, works good.
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Great Product
Reviewed in the United States on May 19, 2026Product 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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Great product
Reviewed in the United States on March 27, 2026Works 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 helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Dicor is excellent.
Reviewed in the United States on May 9, 2026Excellent product. Works as it should.
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Worked perfectly on my camper roof!
Reviewed in the United States on May 2, 2026I 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 helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
RV Roof Sealant That Self-Levels and Stays Flexible
Reviewed in the United States on April 18, 2026RV 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
CB5 out of 5 starsBuy lots! Works great and you’re going to want 2 tubes
Reviewed in Canada on August 13, 2019Great 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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Jimmy O5 out of 5 starsWorks great and worth every penny!
Reviewed in Canada on October 24, 2025Dicor 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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Mike5 out of 5 starsWorks as expected
Reviewed in Canada on February 9, 2026Easy to work with.
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Mark Wilson5 out of 5 starsGreat product
Reviewed in Canada on November 1, 2019As advertised.
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AppleJaxx5 out of 5 starsAwesome Product!
Reviewed in Canada on July 17, 2025This 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 presents key product information
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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
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
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
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
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