Stop leaks before they start with an easy-to-apply and durable RV caulk product.
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It's critical to maintain the roof and other areas on your RV, as leaks can cause major, and potentially expensive, problems. That's where a good-quality RV caulk comes in, working to prevent leaks by patching seams, holes, and problem areas where moisture, rain, and debris can enter your RV’s confines. It also keeps mold and mildew from forming, which is not only unsightly but also unhealthy.
The right caulk forms a solid and watertight seal to keep all moisture out. Our buying guide below features some of the best RV caulks available as well as some features to look for in order to find the best product for your needs.
Alpha Systems Self-Leveling Lap Sealant
Geocel Pro Flex Crystal Clear RV Sealant
I chose the best RV caulk options by taking a look at the most highly recommended and best-loved caulks online. I sought out products that RV owners turn to regularly, including those from reputable brands with easy-to-use, long-lasting reputations. The caulks that made the list were those that can meet a variety of sealant or caulking needs, and they all offer durability, a strong weather-ready seal, and the ability to prevent leaks under all kinds of outdoor conditions. I also included options for different needs and price points.
The only potential downside to this caulk? It’s a strong formula, so it can be pretty potent to work with; it can cause nose, throat, eye, and skin irritation. To avoid this, make sure you’re applying the caulk in a well-ventilated area (or outdoors).
Works on rubber, metal, fiberglass, aluminum, wood, and TPO
Can irritate nose, eyes, and skin when applying
Just keep in mind that since this RV caulk is self-leveling, it’s only suitable for horizontal applications. Additionally, it can’t be used to create a seal on all materials; it’s only recommended for rubber, metal, and fiberglass.
Withstands weather exposure and conditions
Only works on fiberglass, metal, and rubber
However, before you stick your bare finger into this caulk, make sure to wear gloves. Users note that it’s incredibly sticky and, once dry, pretty hard to get off your skin. It’s even hard to get off fabric, should you try using any to wipe up excess caulk. And it can be tricky to level perfectly if you’ve applied a bit too much.
Adheres to a variety of materials and surfaces
Works and seals even on damp, oily, or frozen surfaces
Can be resealed over time
Gloves should be worn during application
Hard to smooth out when excess is applied
The only downside is that as this caulk ages, it can dry out and become tough to work with. If you’re thinking about buying multiple tubes to keep for years, you may only want to keep what you’re going to use within months or a year.
Adheres to most materials and surfaces
Caulk can get sticky as it ages
The only real downside to this non-self leveling caulk is it’s stiff and hard to apply. You’ll definitely need some force to get the slow-moving, thick solution out of the tube, but it’ll definitely stay wherever it’s applied once you do so.
Works on a variety of surfaces and materials
Comes out slowly and can be stiff
A must-have for every RV owner and a highly durable, reliable product, Dicor Self-Leveling Lap Sealant is a caulk that can easily and quickly seal up any areas that might be prone to leaks or cracks. If you’re looking for a more affordable product with good value, Alpha Systems Self-Leveling Lap Sealant is another great option that delivers strength and durability for the long term.
Not all RV caulk is the same, so when you’re shopping for a solid solution for seams, cracks, and other areas that might spring a leak in inclement weather, here’s what you should look for.
When you’re dealing with liquid (well, semi-liquid but thick) RV caulk and want to make sure it applies evenly and smoothly across a surface, self-leveling is a great choice. This kind of caulk stays soft and malleable long enough that it can automatically level itself out for a flat, strongly-sealed final result. It’s a great choice for any horizontal surface, like an RV roof or around horizontally laying vent seams. And once it dries, you’ll get a seal strong enough to resist water, stress, and movement. However, because it remains soft for longer, it isn’t a good option for vertical surfaces; if used vertically, it can drip, run, or sag.
The alternative to a self-leveling RV caulk is a non-self leveling caulk formula. These sealants are just as strong as the self-leveling variety, though they don’t expand or contract once applied because they stay more solidly in place. A non-self leveling caulk must be manually spread, and you’ll need to carefully smooth and level it out yourself while you’re applying. It won’t run, which can be a little easier to manage, but it’s really best for vertical surfaces and controlled applications. Once dry, this kind of RV caulk will resist water and stress, preventing cracks from forming and spreading.
RV caulk is, generally, pretty affordable. Sold in small tubes that can cover individual seams, leaks, cracks, and more, your typical container of caulk will cost between $8 and $15. However, if you’re opting for caulk in the form of tape (butyl or putty tape), you should expect to spend anywhere from $20 to $35 for a roll or two. You’ll also encounter higher prices if you buy caulk tubes in bulk packages of three or more, but these can provide great value if you always want to have caulk on hand.
You’ve got questions. The Drive has answers.
A: Yes! Silicone caulk works perfectly on roof cracks, around the edges of windows, skylights, and vents, or anywhere else your roof might need a little TLC.
A: You definitely want to perform a little surface prep before applying caulk to any of your RV’s surfaces. Whether you’re working on a large or small area, you’ll want to do a quick cleaning and wipe away any residues, dirt, or debris that may be hanging around. This ensures you’ll get a true, effective seal from your sealant.
A: You can use liquid caulk or tape caulk to seal up your RV seams. It’s entirely up to your preference – tape is super convenient, but it’s expensive, while liquid caulk can be a bit messy.
Our reviews are driven by a combination of hands-on testing, expert input, “wisdom of the crowd” assessments from actual buyers, and our own expertise. We always aim to offer genuine, accurate guides to help you find the best picks.
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