Time to Roll Up Your Sleeves. Here’s Your DIY Metal Roof Sealant Step-by-Step Guide!

Want a fully waterproofed roof that lasts for decades to come? Here's your DIY metal roof sealant step-by-step guide. Let’s get started!

Metal roofs are becoming more and more popular these days due to their durability and cost-effectiveness. If you're in the market for a metal roof, you can save even more money by applying metal roof sealant yourself. Metal roof sealant is designed to protect your roof from the elements, but it can be tricky to apply correctly. In this blog, I'm going to walk you through the steps for applying metal roof sealant, so you can do it yourself and save money!

Introduction to Metal Roofs

Metal roofs are becoming increasingly popular among homeowners due to their low maintenance and long-lasting performance. Not only are they extremely durable, but they also come in a variety of colors and styles to help you customize your home's look. Metal roofs are also very energy efficient, so they can help you save money on your energy bills. However, if you're going to invest in a metal roof, you'll need to make sure you protect it by applying the right metal roof sealant from the start.   

Why DIY Metal Roof Sealant?

Applying metal roof sealant yourself is a great way to save money on your roofing project. Professional roofers often charge a premium for their services, so doing the work yourself can save you a significant amount of money. Plus, the process of applying metal roof sealant isn't overly complicated. This means that with the right tools and some patience, you can get the job done without too much trouble.

Choosing the Right Metal Roof Sealant

To get started, you’re going to want to have the right metal roof sealant. I’ve got you covered here. Liquid Rubber’s MetalSafe Sealant is designed to protect your metal roof from high corrosion, as well as impact events like hail, chipping and abrasion. It is also resistant to UV light as well as rust, and has been tested and formulated to withstand even the most severe of weather conditions. It’s your one-stop waterproofing and rust protecting solution for any metal roof! 

Preparing the Roof for Sealing

Before you begin applying the metal roof sealant, it is important to properly prepare the roof. 

  • The first step is to clean the roof and remove any dirt, grime, or debris that may be present. You can use a pressure washer or a garden hose to wash the roof, but make sure to use a gentle setting to avoid damaging the roof.
  • Once the roof is clean, you'll need to inspect it for any existing damage. If there are any cracks or holes, you'll need to repair them before you can apply the sealant. You can use a patching compound or caulk to patch any holes or cracks, then let the patch dry completely before moving on to the next step.
  • Finally, you'll want to make sure the roof is completely dry before you start applying the sealant. If the roof is still wet, the sealant won't adhere properly and won't provide the protection you need.

Applying the Metal Roof Sealant

Once the roof is properly prepped and dried, you're ready to start applying the metal roof sealant. You'll need some basic tools, such as a brush or roller, a caulk gun, and a ladder if necessary. 

  • Start by applying a thick layer of sealant to the roof using either a brush or roller. 
  • Make sure to cover the entire roof and pay special attention to seams and edges, as these are the most vulnerable areas. 
  • Once the sealant has been applied, let it dry for 24 hours before applying the next layer. VERTICAL SURFACES: Apply a minimum final thickness of 1 gallon per 30 sq ft (2.8 sq/m). It should require around 3-4 heavy coats to achieve a 30 mil (0.76mm) (DFT) membrane.

Inspecting & Maintaining the Sealed Roof

After the sealant has had time to dry, you'll want to inspect the roof to make sure there are no gaps or cracks. You can use a flashlight to inspect the roof in dark areas and make sure the sealant has been applied properly.

Once the roof has been sealed, it is important to maintain it to ensure it continues to provide protection. You should inspect the roof regularly for any signs of damage or wear and tear, and reapply sealant as necessary. Additionally, you should also clean the roof regularly to ensure it is free of debris.

Common Mistakes to Avoid

Applying metal roof sealant is relatively easy, but there are a few common mistakes you should avoid. The first mistake is not preparing the roof properly. If the roof is not properly cleaned and dried before the sealant is applied, it won't adhere properly and won't provide the protection it is designed to.

Another common mistake is not using the right type of sealant for the job. Make sure to research the different types of sealant available and choose the one that is best suited for your needs Lastly, make sure to apply the sealant in generous but even layers. Applying too much sealant can cause it to crack and break over time, so make sure to follow the directions carefully and apply the sealant in even layers.

Benefits of Metal Roof Sealant

Metal roof sealant offers a variety of benefits for both homeowners and businesses. It can help extend the life of your roof by protecting it from the elements, and it can also help make your roof more energy efficient by reflecting heat and keeping the interior of your home or business cooler. It can also reduce noise from rain and hail, and it can help protect your roof from UV rays, which can cause fading and discoloration over time. 


If you want your roof to last, applying metal roof sealant is an important part of protecting it from the elements for years to come. It is relatively easy to apply yourself and can save you a significant amount of money on your roofing project. Just make sure to research the different types of sealant available and follow the instructions carefully to ensure the best results. With the right tools and some patience, you can easily apply metal roof sealant yourself and save money in the process. 

For even more tips, we recommend that you read our related guide: Your Professional Guide to Metal Roof Waterproofing with Liquid Rubber

Liquid Rubber is the preferred solution for many homeowners and DIY enthusiasts, with easy-to-apply products and video tutorials that help you get the best results. Browse our online catalog to see our products, and easily order all the supplies we've featured here.