Skip to Content

Best 4 Flex Seal Alternatives

Best 4 Flex Seal Alternatives

Sharing is caring!

Flex seal is one of the best sealants you can use on any surface like wood, tile, concrete, or porcelain. Such a sealant will be your to-go problem solver and ensures there are no leakages in your house. Flex seals can work on dry and wet surfaces, and their features may make you think it’s hard to get the best alternative for it.

However, there are several alternatives you use when you can’t find or afford a flex seal. You can settle for liquid rubber waterproof sealant, rain guard water wood sealer, or liquid rubber RV roof coating. Most of these sealants are not yet popular as flex, and some are way cheaper but work well as flex would. 

Let’s learn more about flex seal alternatives so you have more options to choose from.

Flex Seal Alternatives

  1. Liquid Rubber RV Roof Coating
  2. Liquid Rubber Waterproof Sealant
  3. Rust-Oleum Leak Seal Flexible Rubber Sealant
  4. Rain Guard Water Wood Sealer

Liquid Rubber RV Roof Coating

You can use this liquid rubber sealant for RV roof coating in place of a flex seal. It will enable you to seal off your roof without spending much money as it’s affordable and durable. This sealant is water-based, making it eco-friendly, and doesn’t require much work during application.

It’s also multi-purpose as you can apply it on gutters, fences, or trailers. It also suits indoor and outdoor use on any surface.

Liquid Rubber Waterproof Sealant

The liquid rubber waterproof sealant is ideal for those who don’t like using spray cans while sealing on surfaces. It best suits roof coating on areas that are affected by frequent rains. But it can also work on metal, wooden or concrete surfaces just as a flex seal would, making it a perfect alternative.

You should use a brush to apply the sealant to the affected areas. Do a few coats and permanently remove the leakages as the rubbery sealant will harden and become a waterproof layer. When using this sealant, ensure you give each coat adequate time to dry to get the best results.

Even though flex seal is advantageous because it’s easy to apply, this liquid rubber sealant will enable you to save some money as it’s cheaper. It’s also harmless as it’s a water-based sealant allowing you to seal surfaces within the house without any side effects.

Rust-Oleum Leak Seal Flexible Rubber Sealant

Another perfect alternative to flex seal is the rust-oleum leak seal flexible rubber sealant. It works just as a flex seal would on different surfaces. Unlike other liquid sealants, it dries faster and gives a perfect look on surfaces.

However, it takes the lead if you’re looking for a sealant for doing several coats as it dries faster than a flex seal. It’s also a better choice because of its high-water resistance properties, just as flex seals are. The other area it outperforms flex seal is durability, as it lasts longer even when exposed to extreme conditions.

The major difference between them is their cost as a flex seal tends to be much more expensive than this leak seal. Rust-oleum leak seal, however, doesn’t work on gasoline containers, although it has high flexibility.

Rain Guard Water Wood Sealer

You can also save a few coins when you opt for a rain guard sealer, which works best on rain-washed surfaces. Applying this sealant on your wooden surface will prevent them from having mold or mildew, which makes them vulnerable. So, it’s an ideal choice for outdoor wooden surfaces to experience high bacteria infestation.

But this doesn’t mean you can’t use it on other surfaces like concrete, tile, or porcelain, making it an alternative to flex seal. The only difference between the two sealants is that the rain guard requires mixing while the flex seal comes in a ready-to-use form.

Are These Sealants Effective Than Flex Seal?

Each of these sealants has unique features that make them stand out from the rest. The products’ features also make them the best alternative to flex seal. But any of them beating the flex seal depends on what you want to use it for and the outcome.

For example, a spray liquid rubber sealant is easy to apply and comes in a ready-to-use form. It also takes less time to cure off and gives the best results. All these features point to rust-oleum, which is the best option than flex seal and is also cheaper.

However, if you don’t want a spray sealant but need to get durable coats that can withstand any weather condition, pick on any of the sealants. An ideal pick is using one of them, like LR RV roof coating that works on various surfaces and is inexpensive.

What To Consider When Choosing the Best Sealant?

Before settling for any of the sealants as an alternative to flex seal, consider the following:


Some sealants come in liquid forms, while others as sprays. The formulations determine the application method. So, if you want easy to apply sealant, go for the spray options that come in ready to use form. But the liquid ones will require you to mix the content and then use a brush to seal off the surfaces.

Cure Time

You also need to consider the time each coat will take to dry. A sealant that takes less time to cure allows you to do more layers giving desirable results. A fast cure time also reduces your wait time before using the painted object. Remember touching the sealant before it dries well will give it an imperfect look and give room for leakages.


You don’t want to seal off a surface, and then before long, you come back doing the same job. That’s why you need a durable sealant that withstands extreme weather conditions. A durable sealant will also reduce your maintenance cost and let your surfaces look better for longer.


You need the best sealant for your projects. But this doesn’t mean you’ve got to spend a fortune on any of them if you can get an alternative best product cheaply. This means you have to consider the price of competing products to save some cash. Ensure the sealant you opt for is within your budget and meets your demands.


Why pay more for less? If you believe in this narrative, then you’ve got to be keen on the size of sealant you buy. The bigger the can, the more sealant you’ll have for your project. So, look at the sizes of the sealants, compare their prices and go for the best.

Available Color Options

Sealants come in different colors. If you choose a sealant in your favorite color, you’ll not have to paint the work area. Some sealants also are not paintable, so if you pick the right color, the surface will look cool. For example, flex seal spray is available in white, gray, clear, and black shades, giving you a variety to choose from.

Bottom Line

You don’t have to stick to one product, especially if several cheap alternatives give the best results. That’s why you need to get the flex seal alternatives and seal off leaking surfaces without a struggle. An alternative will also save you when flex seal is out of stock in your area, but you urgently need to work with a sealant. 

But ensure you consider a perfect alternative that’s easy to apply, has less cure time, and is durable. Also, check on the pricing and the sealant’s size before settling for the alternative. 

Was this helpful?

Thanks for your feedback!