I cannot give a recommendation one way or another as we've not had any problems.  However, based on comments made on three different RV forums where I participate, Eternabond is one that is suggested a lot of times.

Eternabond Website

Terry

Lyman wrote:

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In your opinion, what would be the best sealant to use to reseal seams? Manufacturers say to check seams every 6 months but don't really say what to use. At least I haven't come across recommendations.

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I don’t know if you are referring to a rubber roof sealer or a lap sealer such as might be used on a fiberglass panel / escutcheon seam joint – i.e. a joint type seal that can be painted and becomes hard.

 

Typically referred to a “Dicor” by many, the roof sealer product is in wide use and will seal the joints between the rubber roof and items protruding through the roof like a skylight or a vent fan.  It is “self leveling” and works quite well.  Comes in a tube for about $9.

 

The company Dicor makes different types for many of these types of applications.  I suggest going to an RV Supplier and asking for advice in addition to reading the labels for yourself as to the particular product's application / use.  

 

I have been pleased with the Dicor products and have used it in many different applications.

 

Bill

I agree with Dicor. Just had to take a small portion of it off to gain access to some wiring. The stuff was still real flexible after several years. It was a pain to get off so no water was getting by this stuff. After experiencing it first hand I'm sold on it.

Lyman wrote:

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Right now looking at evergreen everlites.

How is Dicor at resisting cracking.

 

Polyurethane has been mentioned. Some prefer it over silicone. Understand Evergreen uses silicone.

opinions?

"Dicor" doesn’t crack if you are referring to the rubber roof sealer version of “Dicor.”  At least not in the many years I have used it.  Now, many will tell you that with a rubber roof you should reapply and “freshen” once a year along with a good roof cleaning.  While that is possibly overkill in some opinions, not mine, it is a lot less expensive than water damage.

 

The “Dicor” that I have used as a joint sealer, different product, like between fiberglass panels and the escutcheon cover panes, hasn’t cracked in 6 years.  The silicone has.

 

I have not had as good a result with some silicone based products.  However, it depends on your application.  If you’re talking about a roof product you want something that can be removed and replaced when necessary.  That said; always follow the roof manufacturer’s recommendations.  Dicor was the OEM product with my current roof and it has preformed well.

 

Bill

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