Our 5 Highest Rated RV Sealant & Caulk in 2020

If you love RVing as much as we do, you are going to be as comfortable as possible on your next scheduled trip! Safety means comfort, so you cannot overlook the importance of a strong RV sealant & caulk. This article will be highly informative in those regards!

Table of Contents

 Our Top 5 Picks

Dicor RV Sealant


ToughGrade Sealant


Geocel Sealant


3M RV Sealant


Tremco RV Sealan


RV Sealant & Caulk Of 2021

Best Bang For You- Dicor 501LSW-1 Lap Sealant

Dicor-501LSW RV Sealant

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Dicor-501LSW RV Sealant

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Dicor is an exceedingly popular and high-quality RV sealant brand which is available in all retailers across the country. Dicor products are unanimously trusted among RV enthusiasts and this product is no different. Dicor is a leader in the RV sealant and caulk industry.

This product is watertight, which means you will not have to worry about leaks in your RV during heavy rainstorms, and other inclement weather conditions. This is also a very multifunctional product due to its super adhesion! Dicor 501LSW-1 Lap Sealant can easily hold onto fiberglass, vinyl, concrete, wood and even aluminum!

Another outstanding feature that can be easily overlooked is the products ability to perform tasks on just about any part of your RV. More than just the ability to seal your roof! This RV sealant can also be used to fill in potential leakage points in screws, piping, and air vents!

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his review is for Dicor 501LSW-1 Lap Sealant. This sealant is for use on horizontal surfaces. Do not use it on vertical surfaces or it will run down the sides. There is a negative review on this product complaining that it does not self level, the negative review is mis-leading. This product does self level. I think the person who purchased it and was disappointed thought it would be a molasses like consistency that would run and spread thinly and evenly. That is not what this product does.

This works great on things like roof vents and where ceiling fans protrude from the roof. It kind of works this way, lets say you have a screw head you want to cover, put a 1/2″ high glob of 501LSW on it that completely covers the screw head. After a few moments the glob will spread out to a larger circle and be about 1/4″ high. If you are using this like traditional caulk and just running a bead of it, that wont work right. It has to be a tall bead of caulk so that it can level out. Like the example above with the screw head, if you put a bit of caulk on the screw head that is 1/8″ high that wont spread and it probably wont self level much either.

This stuff is meant to be put on in a generous manner, it is not going to look pretty but it will flow into nooks and crannies and fill potential leak spots. If you are near the edge of your roof be careful as this can level out by the roof edge and drip down the sides. In a way it is similar to baking cookies, you put a ball of cookie dough on a sheet and as it bakes the dough ball spreads out and makes a thin cookie. If you think of this product like the cookie i think it will be closer to expectations.

If you need an item for a vertical surfact this is NOT it.

Best For Metal Roofing –ToughGrade Self-Leveling RV Lap Sealant

ToughGrade-Self-Leveling-RV-Lap-Sealant

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ToughGrade-Self-Leveling-RV-Lap-Sealant

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Tough Grade products certainly live up to their name, and this product must be tough grade. If your RV features an aluminum roof, or need other metal like materials sealed properly, then this is the right product for you. Apart from being a very tough grade product, it is quite easy to use, which makes it a great choice for a first-time buyer.

Another amazing feature with this product is that it is a self-leveling sealant, which means it spreads itself out. However, with that convenience comes a price tag that some might not be 100% happy with. A 4 pack Tough Grade Self-leveling RV Lap Sealant costs $34.50 but is widely available by most retailers. You get what you pay for, as this product is also highly ultra-violet and water resistant.

Nothing says comfort like knowing the product you used to seal your metal roof on even the hottest and most humid days in the summer months without distorting or failing on you in any way! That also apply to those rainy days when it is pouring!

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Used to reseal various portions of RV roof. 4 tubes were sufficient for our 19′ trailer.

We thoroughly washed the RV roof in advance, with special attention to scrubbing caulked areas, and then let it dry completely. Before applying the new sealant, we wiped each area with a cloth dipped in mineral spirits. The existing sealant was then very clean and slightly tacky. The new sealant was applied with caulking gun. We dabbed it on existing sealant – covered it completely at approximately 1/8 inch think. Somewhat like frosting a cake. It took my wife and I around 3 hours total, from initial cleaning to applying sealant.

The sealant smoothed out by the next day and is somewhat pliable.

Seals look very good now and our RV is ready for another season.
E. Thompson

Best-Looking Finish – Geocel Pro RV Flexible Sealant

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We have already mentioned how certain RV sealant & caulk can tend to appear in a certain color once applied, and then dry another color. This can be very frustrating, especially when you are the proud owner of a beautiful RV! Geocel is aware of this fact and has created a product which makes any RV caulk job a lot less obvious, yet still does a fantastic job sealing potential leak areas!

This might not be the greatest of concern to the typical RV owner, especially if the caulk job(s) are in obvious places such as the roof or window areas. However, this product maintains the same great finish when applied to more visible areas such as the RV’s air compressor and the air conditioning units alike!

This product levels out smoothly and easily which makes for a very professional look once the job is done! With that professional look comes a hefty price though, as Geocel 28100V Pro Flex Crystal Clear RV Flexible Sealant runs about $54.00 per 4 pack.

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This is the industry standard for sealing anything on the side of your RV. One trick I learned was that you do not have to run a super neat bead. Run your bead as neat as you can then spray it with soapy water. You can then easily smooth out the bead with your finger, without it sticking to your finger. It gives you really professional looking results.

Fastest Solidification, Best Defense 3M Marine Adhesive Sealant

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3M has established a solid history of producing quality products, and this strong adhesive is certainly no exception. This marine-grade adhesive gives you the peace of mind of knowing that once you seal a crack or break, you can expect the bond to hold permanently.

3M Marine Adhesive Sealant also dries and solidifies faster than other sealants! While others take a few days to really stick and harden, 3M takes only  two days at the longest. Even the most extreme weather such as earthquakes, snowstorms and heavy rains are no match for this products bonding ability.
Unlike some other sealant products, this product is not the best if you have holes you are looking to fill in. Where 3M Marine Adhesive Sealant really shines is its ability to retain its strong bond through extreme circumstances.

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Great Permanent sealer!!!

I use this on my boat to permanently attach accessories, even below the water line. However, I can not repeat this enough – This sealer is PERMANENT!!! If you try to remove anything attached or sealed with 3M 5200, you will destroy your fiberglass hull!

If you are anticipating removing whatever you are attaching or sealing, I would HIGHLY suggest that you use 3M 4200 sealer!

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Tremco is an immensely popular brand which is used among construction contractors for various interior renovations and general usage! This is an extremely versatile product which is capable of filling virtually any seal, crack, or hole inside or outside of your RV.

Vulkem 116 also works well with windows, ceilings, wall repairs, as well as masonry with relative ease. This product is exceptionally durable and can easily withstand heat and rain as this is a watertight product. Leaks should never be a concern if you are armed with this product!

If you are new to applying caulk,  one potential problem while using this product you may encounter is that it is quite messy and emits a rather foul odor. You may want to consider performing all your sealing and caulking about a week before you roll out on your road trip, so you have time to get rid of the smell.

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For the effort involved in caulking my house and wood fencing I will pay extra if I get more years between applications. Up until I learned about Vulkem from a contractor the best I had found was a Loctite caulk. Not sold in the big box stores that push DAP and other economy calks. Cheaper caulk costs as much for the product in the long run but costs more if you value your time or are paying someone else to do the caulking.

Paintable after 30 hours. Full cure time depends on how thick it is applied and for deep grooves it is best to use filler rod.
 

Final Words

No matter what your personal RV sealant & caulking needs may be, there is a product out there for you. Whether this is the first time you have used a caulk gun, or your 100th time, you are sure to find the product that suits your needs after reading this article.