Understanding Roof Sealants

One of the most popular choices in roof coatings are actually roof sealants. These materials are designed to address specific needs, including the type of roof, the conditions to which they are subjected, and they can provide weatherproofing and reflectivity. Knowing what kinds of roof coatings are available is an important part of determining which option will work best for your situation. The following are some of the most widely used roof sealants.

Urethane Sealants

Roof coating manufacturers have been creating polyurethane-based sealants since the early 1960s, and they have certainly come a long way since that time. These sealants are available in systems that use one and two part moisture-cure and oxygen-cure processes. These roof coatings are most popular for use with EPDM membranes, especially in areas around flashing, coping, pitch pans, and termination bars, as they provide a water resistant seal. Urethane sealants range in price, but the lower end options tend to have very poor resistance to UV exposure. Additionally, they cannot stand up to anything other than very minimal dampness at the time of application, as the added moisture results in outgassing. When this occurs, the expansion and frothing that occurs results in extensive damage to the coating.

Silicone Sealants

Silicone is another popular option for roof coatings, and there is a wide range of formulations. There are acetoxy-cure formulations, which are generally the cheapest, and the more expensive oxime-cure formulations. Acetoxy roof sealants can’t be used on metal surfaces due to corrosion, but they do resist discoloring due to UV exposure. Oxime-cure silicones work well with metals, provide better adhesion, and resist weather, but they do tend to discolor after UV exposure. These roof coatings are not a good option for areas that have substrates that release heat and oil, as this tends to loosen adhesion.

Polysulfide Roof Sealants

Polysulfide sealants have a long history of use, and they are elastomeric in nature. They tend to be more expensive than other options, but they provide excellent resistance to weather exposure, allowing for a long life of around 20 years before cracking occurs. This sealant will generally need to be applied over primed surfaces, and it has longer curing periods.

Polyether Sealants

Polyether roof coatings are moisture-cure, and provide increased durability over some of the other roof sealants available. These sealants have a good rate of adhesion, and can be applied in colder temperatures without compromising the material. They provide good weather resistance, are environmentally friendly, and are highly OSHA complaint. They are easy to apply, fast curing, and typically last for 20 to 30 years when applied properly.

When it comes to choosing the right roof coating manufacturer, your best option is to make sure to compare products. Some of these sealants are better for certain jobs than others are, and making sure to understand the best applications will improve the life of whichever roof coating you choose. By paying close attention to the choices, you will be able to choose the material that best meets your needs.

The Proper Methods for Repair with EPDM Coating

EPDM, which stands for ethylene propylene diene monomer, has a proven history of providing exceptional life after application in all climates. However, there are times when the material might become damaged. In most cases, this damage occurs due to a seam lifting. This can be due to improper application due to the installer failing to use enough adhesive, or because the membrane was not cleaned properly. Whether the repair is needed due to damage or a seam, the following steps will help you make the proper repair with EPDM coating.

Plan It Out

You will want to plan your repair ahead of time to make sure the weather is going to provide the best conditions. The EPDM will require temperatures of around 55 degrees to cure properly. You will also want to complete the repair with EPDM coating when it is not scheduled to rain. While it will be waterproof right after it is applied, rain can make it appear spotted if it hasn’t had time to cure. It will usually take around nine days for the EPDM to fully cure, or considerably longer if it is applied during cold weather.

Get the Surface Ready

You will need to double check the roof to make sure you have all the areas that need repaired ready. They should have any holes or gaps filled in with a non-silicone caulk. Once those areas are filled in, the area will need to be cleaned thoroughly. A pressure washer works best, but if that isn’t available, you’ll want to make sure you remove all traces of dirt and debris. After that, clean the area with a mild soap and water, or something stronger if there is any mold, mildew, or fungi growing. Once the roof is completely dry, you will be ready to repair with EPDM coating.


You will need to mix the catalyst following the directions provided with your product. You will need a nap roller to ensure an even coating. If there are any areas in which the roller won’t fit, you can go back after the rolling is complete and use a paintbrush to touch up any of those areas. Your goal is to apply a single coat that is around 20 mil thick, which generally equals one gallon to around 40 square feet on a smooth surface. If you are unsure of the proper thickness, take the time to measure off the 40 feet (or 30 if you are working with unsmooth areas), as you want to make sure you have the right thickness. If it’s too thin, it might crack, and too thick will lead to bubbling or excessive swelling.

Make sure to cover the entire surface completely and evenly at the recommended thickness to ensure a proper repair with EPDM. Due to the nap of the roller, it will look slightly bumpy, but the liquid is self-leveling, so this will go away as it cures. If you followed these steps, your application will just need to cure, and the process will be complete.

Liquid Rubber EPDM Roof Coating Application

When it comes to rubber roofing, there are few that can compare to EPDM membranes, except, of course, the liquid rubber form. This roof coating provides all the properties you expect from the traditional roofing membrane, yet is in a liquid form that provides numerous benefits. If you are looking for a roofing option that will protect against leaks and withstand any kind of weather you can throw at it, EPDM liquid roof repair is the best option. However, it is important that you understand a few things about the application process to ensure the superior results you are looking for.

Understanding the High Solids EPDM Rubber

EPDM liquid rubber uses a cure mechanism that converts it from the liquid form at application to a solid elastomer. It is designed to withstand both cryogenic temperatures and extreme steam heat, all without breaking down. Liquid rubber EPDM requires only a single coat, making it a cost effective, timesaving solution over other liquid roof coatings.


In most cases, the liquid rubber application does not require a primer, which further lowers costs and time. The following are some of the substrates that do not need to be primed prior to application:

  • EPDM Membrane
  • Weathered Fiberglass and Steel Siding
  • Weathered Corrugated Metal and Standing Seam Roofs
  • Weathered Polycarbonate Plastic, Vinyl, and PVC
  • Foam Pipe Insulation
  • Cast Concrete

While this product can be applied as an airless spray in some situations, when working with flat roofs, it requires a roller and a squeegee to get the job done.

A Note on Mixing

When mixing the catalyst into the liquid, you need to ensure that you follow all mixing directions exactly to ensure the best cure after the liquid rubber application. Trying to cut down the mixing time will not make the process any faster, and will only result in a subpar application.

Rubber Membrane Application

Liquid rubber EPDM coating can be applied over the EPDM membrane with only a thorough cleaning in most cases. However, if the membrane is older, it is very large, or cleaning is not quite practical, a liquid rubber surface conditioner is recommended to ensure proper adhesion.

What to Know About Liquid Rubber in Detail?

It’s almost impossible for you to be unaware of liquid rubber as a roofing technique in an age where online information is so easily available. If you are unaware of the benefits and the method of application of liquid rubber, and want to know about it in detail, utilize online sources of information by getting help from your favorite search engine for this purpose.

Liquid Rubber

Liquid Rubber

If you are wary of manufacturers’ websites and don’t want to rely on them to get information about liquid rubber, you still have numberless options to look. For example, use the online reviews, comments and critical opinion about this roofing method. Through these sources of information, you will be able to know what exactly liquid EPDM and rubber is all about and what are its advantages or limitations if any. While relying on the online reviews and commons about this roofing technique, you also need to be careful to sift what is good for you and what seems biased. Some of these reviews can be merely an attempt by the promoters to enhance the publicity of the product, whereas some content can be targeted at undermining liquid EPDM and products related to it.

Liquid Rubber

Liquid Rubber

To discover what liquid rubber can offer and what it cannot do, you have to look at the online forums and websites which have a good reputation from the perspective of giving neutral and candid information. Some of these reviews are submitted by users themselves. This can be good place to start because experiences which are based on a user’s personal observation don’t have any alternative. Another easy option for you to accomplish your research successfully is through relying on websites which fall in the category of being encyclopedias, dictionaries and reference materials.

If you realize that a manufacturer has tried to submit credible information about liquid rubber, there is nothing wrong with utilizing such information to enhance your knowledge about this roofing technique. Even if you do not find enough material online about this roofing technique which should be a rarity, you can consult some off-line magazines, journals and content which deal with such repair work. Maybe ask your friends, colleagues or the experienced industrialists and individuals who might have considerable experience regarding roof repair techniques. A combination of information coming your way from all these varying sources is guaranteed to equip you with valuable information about liquid rubber.

Why You Should Opt for Liquid Rubber?

You should opt for liquid rubber as it is a very useful, efficient and unique matter which has been used as a roofing solution with tremendous success. It was originally created by Kuraray Co. Ltd. in 1972 as a thick, viscous liquid which is derived from butadiene, isoprene and/or styrene. It is transparent and odorless. One of the primary uses is that it is used at a “Reactive Plasticizer”. It comes in liquid form and when used, it cures to form a hard and sturdy surface holding almost any required shape. It is successfully used for a variety of purposes, ranging from toys which are molded to useful roofing solutions.

Liquid Rubber Application

Liquid Rubber Application

Liquid rubber has been specially used all over the North America for over 20 years, in places and areas where extreme temperature spikes and fluctuations is a norm. It is very easy to use and an extremely productive seamless waterproof membrane. Due to its special characteristics, it can easily meet most of the health, safety and environmental requirements, and therefore provides great industrial and commercial benefits.

Applying liquid rubber is a simple, hassle-free and safe process. You can apply it on the required surface area using a brush and roller which is more appropriate for small scale residential projects. The large scale projects, for which you can use it, include factory or warehouse roofing which uses a spray system. It can be sprayed on the required surface area and this method can be used to cover up to a thousand square meters in a single day. This method is generally referred to as “Instant Set”, and it does exactly what the name suggests – the liquid rubber takes the required shape naturally and instantly, giving you instant waterproofing. Since the rubber that is sprayed is cold, it also eliminates any potential fire hazards, and it forms itself quickly as singular and seamless membrane. Since this method does not require the usage of any fleeces or primers, this method of roofing has proved to be up to five times faster than many other comparable roofing solutions.

Its unique composition gives its users an astonishing elasticity of up to 1100% along with a startling memory of 95%. It is almost unparalleled when used as a roofing solution on roofs which are expected to face excessive movements.

EPDM Roof Coatings

Application of EPDM Roofing Materials

This roofing solution provides similar advantages to that of EPDM roofing solution – it offers protection against ozone and heat, as well as provides good resistance against polar substances and steam. Additionally, liquid rubber roof is also resistant to water, salt and alkalis. It also gives a smooth, crease-free surface, and is easy to apply. The only issue with this type of roofing is that you cannot directly apply it to asphalt roofs or asphalt shingles. You need to first apply a coat of acrylic solution on which the liquid rubber can then set itself.

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