Is Hot Glue Permanent? Everything You Should Know

Hot glue is a popular adhesive used for various DIY projects. It can adhere different materials such as plastic, wood, metal, and paper to each other. One of the commonly asked questions about hot glue is whether it is waterproof or not. In this blog post, we’ll find out the answer to that question and learn its waterproofing capabilities.

What is Hot Glue?

Hot glue, also known as hot melt adhesive, is a type of thermoplastic adhesive that is melted and applied using a hot glue gun. When the glue cools, it solidifies and creates a strong bond between the materials it’s applied to.

Is Hot Glue Waterproof?

Hot glue is not completely waterproof, but it is water-resistant. This means that it can withstand some exposure to water but not necessarily completely submerged or soaked. The water resistance of hot glue depends on the adhesive’s curing time, the material to be bonded, and the amount of adhesive applied.

To improve the waterproofing capabilities of hot glue, you can use a waterproofing agent. Several waterproofing agents can be used, such as silicone, epoxy, or polyurethane. These waterproofing agents can be applied along with the hot glue to provide an extra layer of protection against water or moisture.

Applications of Hot Glue for Waterproofing

Hot glue can be used to create a water-resistant barrier in electronics or outdoor applications. It can be used to seal gaps in windows and doors to keep out water.

Hot glue is also useful in creating waterproof seams on garments and fabrics.

However, keep in mind that hot glue is not suitable for applications that require complete waterproofing, such as swimming pool repairs or fixing water pipes.

Is Hot Glue Waterproof on Fabric?

Hot glue tends to adhere fairly well to fabrics, but its waterproofing capabilities on fabric are limited. It might provide a temporary water-resistant bond, but if the fabric is washed or exposed to water frequently, the hot glue’s adhesive properties may weaken over time.

For fabrics that require long-lasting waterproofing, using specialized fabric adhesives or sealants might be a better choice.

Is Hot Glue Waterproof on Plastic?

The water resistance of hot glue on plastic can vary depending on the type of plastic being used. Some plastics have low surface energy and may not bond well with hot glue, leading to potential issues with water resistance.

On the other hand, some plastics with higher surface energy might achieve better results with hot glue.

However, similar to other materials, if the plastic is exposed to prolonged water exposure or extreme conditions, the hot glue bond might eventually degrade.

Is Hot Glue Waterproof on Wood?

Hot glue generally adheres well to wood surfaces, but its waterproofing capabilities on wood are still limited. It might work for indoor projects or short-term applications where water exposure is minimal.

However, for outdoor or long-term uses where the wood might be exposed to moisture, humidity, or weather conditions, it’s recommended to use adhesives specifically designed for outdoor use and better water resistance.

Is Gorilla Hot Glue Waterproof?

Gorilla Hot Glue, like standard hot glue, offers some level of water resistance, but it’s not completely waterproof.

Gorilla Hot Glue is known for being durable and providing strong bonds on a variety of surfaces.

While it might have improved water resistance compared to regular hot glue, it’s important to note that even Gorilla Hot Glue may not hold up well under prolonged exposure to water or extreme conditions.


Is Hot Glue UV Resistant?

Hot glue is generally not very UV resistant. Most hot glue sticks are made from thermoplastic polymers that can degrade when exposed to ultraviolet (UV) radiation from the sun.

Over time, UV rays can cause the glue to become brittle and discolored, leading to a decrease in its adhesive properties.

If you’re using hot glue for outdoor projects or in areas with prolonged sunlight exposure, it’s recommended to consider a UV-resistant adhesive instead.

Is Hot Glue Water Soluble?

Hot glue is not water-soluble. Once hot glue cools and solidifies, it becomes relatively water-resistant. However, prolonged exposure to water or moisture can weaken its bond over time.

While hot glue may not dissolve in water like some other glues, it’s not the most suitable option for applications that require prolonged water resistance.

Is Hot Glue Toxic?

Hot glue sticks are generally considered to be non-toxic when used as intended. They are designed for crafting, DIY projects, and other common applications. However, when heated, hot glue can release fumes that might be irritating to some individuals, particularly in poorly ventilated areas.

It’s a good practice to work in a well-ventilated space when using hot glue and avoid breathing in the fumes. If you have specific health concerns, it’s a good idea to consult the manufacturer’s safety information.

Can Hot Glue Be Used as a Sealant?

Hot glue can be used as a temporary sealant for some applications, but it’s not typically recommended for long-term or critical sealing purposes.

The bond created by hot glue may not be as strong or durable as that of specialized sealants designed for specific materials and conditions.

For important or lasting sealing tasks, it’s better to choose a sealant that’s formulated for the specific materials and environment you’re working with.

Is Hot Glue Permanent?

Hot glue is generally considered to be a semi-permanent adhesive. While it creates a strong bond, it may not be as permanent as other types of adhesives like epoxy or certain industrial-grade glues.

Over time, factors such as temperature fluctuations, exposure to moisture, and mechanical stress can weaken the bond of hot glue.

Its permanence also depends on the materials being bonded and the conditions in which the bond is used.

Does Hot Glue Float in Water?

Yes, solidified hot glue typically floats in water. The composition of hot glue sticks is such that they have a lower density than water, causing them to float.

However, the adhesive properties of hot glue may be compromised if it gets wet or submerged for extended periods, so it’s not a reliable choice for water-resistant applications.

Is Hot Glue Food Safe?

Hot glue sticks are not formulated or tested for use with food, so they are generally not considered to be food safe. It’s important to avoid using hot glue in direct contact with items meant for consumption.

If you’re working on projects that involve food or items that come into contact with food, it’s recommended to use adhesives and materials specifically labeled as food safe.


Hot glue is not entirely waterproof, but it is water-resistant. The water resistance of hot glue can be improved with the use of waterproofing agents.

It can be used for various applications that require water resistance but is not suitable for projects that require complete waterproofing.

So, if you’re planning on using hot glue for your project, keep in mind its water resistance capabilities, and if necessary, consider using a waterproofing agent.

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