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Old 09-09-2017, 08:21 PM   #1
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Brand: Thor Motor Coach
Model: A.C.E 29.3
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THOR #4198
Skylight Replacement - Proper Sealant

Hi,

I hit some branches in the dark and it cracked my skylight pretty good. I called Thor got the part number and have the new one in hand.

I have viewed a couple of videos on replacing it and it looks pretty straightforward.

My question is, the video says to use Surebond SB-140. Is that any different than the Dicor Lap Sealant? And is there anything special needed for a TPO roof?

The Surebond product states it is for skylights though. Maybe it adheres better to the skylight? Mainly wondering if I should expend the effort to find the SB-140. Camping World has SR-140 made by someone else, but it is out of stock (gotta see if the store has any on the shelf yet).

Thanks for your thoughts on this.

This is one of the videos I was looking at: https://youtu.be/aYXFwCOT0Iw


Thanks, John
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Old 09-09-2017, 08:39 PM   #2
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THOR #3186
Yes TPO roofs require a different sealant unless you prefer leaks.
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Old 09-09-2017, 08:42 PM   #3
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Originally Posted by Forest Grump View Post
Yes TPO roofs require a different sealant unless you prefer leaks.
Different than the SB-140 or SR-140? Or is the Dicor sealant OK?


Thanks, John
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Old 09-09-2017, 08:42 PM   #4
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had to look it up. That surebond product is a butyl sealant. Likely not much different than any butyl sealant you can buy at the hardware store....but that's my guess since I've

I would use exactly what I did when I put in my roof vent fan...
butyl tape under the flange (I like working with the tape better than liquid, but I'd suppose either would do)
Then topped with a dicor or similar leveling caulk over the screws and whole thing to seal it in.
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Old 09-10-2017, 12:04 AM   #5
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Dicor has a 2 part sealant for TPO. It says so on the label.
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Old 09-10-2017, 02:21 AM   #6
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I also used the butyl tape on my skylight with the Dicor self leveling around the perimeter.
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Old 09-10-2017, 11:13 AM   #7
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Originally Posted by Forest Grump View Post
Dicor has a 2 part sealant for TPO. It says so on the label.
According to Dicor the new 2 part sealant will eliminate the cosmetic distortion but will not compromise the sealing. You can check out their media release here. Dicor Products introduces Ultra Sealant? to help avoid roofing problems that can occur with some new TPO roofing | The Dicor Corporation | Official Website

The link on the page to the discovery bulletin is broken. On their site though, they do explain in Rudy's Expert Roof Care Handbook, the different types of roofs and which sealant is better for your roof. The problem I found is you need to know what type of backing is on the TPO to know which product to use. Without putting a tear in the material, or taking something apart kind of tough to find out what the backing of the TPO is. I ended up calling Thor and they were more than nice to let me know.
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