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Old 10-26-2021, 03:55 AM   #1
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Fiberglass Roof repair and sealants

I am the new owner of a 2016 Newmar Ventana. During the inspection they found a few spots that needed to be repaired. What is the best product to repair the seams on the fiberglass roof and slides? Do I need to remove the old product or can I put right on top of the old sealant? It appears to be silicone by the slide but obviously the roof uses different sealant. I am new to Rving so any advice is greatly appreciated.
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Old 10-26-2021, 10:41 AM   #2
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AZ Expert on youtube has some good videos on this very subject. Self leveling Dicor is the sealant most used on roofs. The slide joints look like silicone.
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Old 10-26-2021, 10:48 AM   #3
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I just want to add. If you're based in Fla I would check the roof at least twice yearly. Roof leaks can cause a lot of damage and are pretty simple to prevent. Congrats on the new rig.
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Old 10-26-2021, 11:03 AM   #4
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The roof cap transition moldings appear to have eternabond tape installed on them. Usually no need to seal the eternabond tape if it was installed properly. The sealant near the tape looks like Dicor lap sealant. That's easy to remove if required, and re apply new Dicor self leveling lap sealant. The slide is hard to tell what they used, but if it's silicone it will need to be removed, cleaned well and resealed with a quality sealant recommended for vertical applications. (Dicor lap sealant is not recommended for vertical applications) I'm sure someone has recommendations for that sealant, but personally I'd stay away from silicone.
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Old 10-26-2021, 11:07 PM   #5
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Contact Newmar tech support for sealant specs. A drawing showing location of each different product should be provided. You may have this in your black bag provided to original owner. Use this as your guide. Good luck!
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Old 10-27-2021, 07:41 AM   #6
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If you go to the Newmar parts website you will find all the different sealants they used for your specific year, and you can also get information fo you specific coach by using the last 6 numbers of your VIN.
Use Dicor Lap Sealant (self leveling) for the joints on the roof. I’ve found that as long as the existing sealant is well adhered and if you clean the surface well that you can put the new sealant right on top of the old. I’ve done this on my coach several times as well my previous RV’s.
The slide area sealant is most likely Dow clear silicone. For mine it was Dowsil 999-A. Clean the joint up using a plastic putty knife and then reseal.
Congratulations on the new rig.
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Old 10-27-2021, 08:46 AM   #7
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Quote:
Originally Posted by DreamingDuo View Post
I am the new owner of a 2016 Newmar Ventana. During the inspection they found a few spots that needed to be repaired. What is the best product to repair the seams on the fiberglass roof and slides? Do I need to remove the old product or can I put right on top of the old sealant? It appears to be silicone by the slide but obviously the roof uses different sealant. I am new to Rving so any advice is greatly appreciated.
When I first got my coach a few years ago, one of the first things I did was find good long lasting sealant and re-sealed all the joints. What I used was a product you can readily find at HD called Henry's Tropicool. If you used it you will never have to reseal again. It comes in tubes and cans and can be found at most home depots.

You can apply over existing dicor, but I removed as much of the old dicor as possible.
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Old 10-31-2021, 09:45 AM   #8
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Looks like Eternabond with Dicor NON self leveling to seal the top of it.
Newmar used clear silicone on all vertical surfaces on mine. That too would work fine.
I say looks Dicor because it looks like it was tacky and attracted mold / dirt which silicone typically does not.

Just peel off the old, clean paint and tape well with Prep-sol, dry for a few minutes and put either dicor or silicone on it and move on to the next project.
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