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Old 06-27-2022, 01:06 PM   #1
Kmacf350
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Roof lap sealant

I have a 2018 passport 3220 bh looking to reseal roof can I use dicor self-leveling lap sealant ?
And can I use Acetone to clean before ?
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Old 06-27-2022, 01:45 PM   #2
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Yes on the Dicor, No on the Acetone. bad forthe roof membrane. (IMHO) If you have a $1.25 ( dollar store) store there, get some Totally Awesome works great to clean the old stuff and everything else in the world. Black streaks? wipe on wipe off!!!

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Old 06-27-2022, 06:27 PM   #3
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If you can get it where you live, denatured alcohol (also often called fuel on the container) is the best thing to clean the old sealant with first.
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Old 06-27-2022, 06:34 PM   #4
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What type of membrane is on your roof? Tpo can be cleaned with Xylene.
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Old 06-27-2022, 07:45 PM   #5
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Originally Posted by Kmacf350 View Post
I have a 2018 passport 3220 bh looking to reseal roof can I use dicor self-leveling lap sealant ?
And can I use Acetone to clean before ?
When I installed a vent cover on my Alpha Systems roof I used Dicor to seal it thinking it was the same stuff as Alpha Systems sealant. The Dicor caused the TPO to blister where it made contact so I would say itís not the same stuff.
If you have the Alpha Systems roof, stick with their recommended product.
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Old 06-28-2022, 07:02 AM   #6
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Originally Posted by wrvond View Post
When I installed a vent cover on my Alpha Systems roof I used Dicor to seal it thinking it was the same stuff as Alpha Systems sealant. The Dicor caused the TPO to blister where it made contact so I would say it’s not the same stuff.
If you have the Alpha Systems roof, stick with their recommended product.
DICOR markets two types of "self leveling sealant". The older, most readily available type is 551LSW (white) and has the "standard dispersant mixture" (petroleum agents to aid in application flow). https://dicorproducts.com/product/no...-lap-sealants/

The "new and improved sealant" is 610SASLW-1 and marked as "ultra sealant". It contains no solvents or isocyanates. https://dicorproducts.com/product/se...ultra-sealant/

It's the solvent mixture that caused your bubbling, not the "name brand"...

A bit of "history"... DICOR first introduced the EPDM membrane to the RV market, and they were the only producer for a number of years. Then Alpha Systems introduced the TPO membrane and it became the "industry standard" replacing the EPDM type membrane because it was cheaper and weighed less along with other improvements over EPDM.

When TPO first came out, Alpha Systems recommended DICOR sealants for maintenance and resealing. Then, after a couple of years, they started marketing their own line of sealants and "suddenly" DICOR was a no-no.... Ironically, DICOR was "OK to use" until their own products showed up on the market. Now, with the "high solvent sealant for EPDM" and the "Low Voc sealant for TPO" both Alpha Systems and DICOR market the correct sealant mixtures for TPO roofing.

In your issue, it was the "wrong type DICOR sealant" that caused the bubbling, not the brand name.... DICOR Ultra Self Leveling sealant will not cause any TPO softening, just like Alpha Systems brand.

Here's a good article on "RV Roof Sealants": https://dicorproducts.com/eblast/DP-133/a1/ It addresses the "softening and rippling of TPO when using the "standard solvent sealants".
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Old 06-29-2022, 08:36 AM   #7
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How do you tell which membrane is installed on the roof?
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Old 06-29-2022, 09:07 AM   #8
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How do you tell which membrane is installed on the roof?
EPDM was used on older trailers such as mine (2002) and TPO became the majority of application sometime later. You have TPO. Here is a short video if you want to check:
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Old 06-29-2022, 09:38 AM   #9
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Thanks for the video link
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