The difference between caulk and sealant

Caulk and sealant are two common materials used in industrial settings to seal gaps, cracks, and joints to prevent the entry of air, water, or other unwanted substances. While they may seem interchangeable, some critical differences between industrial caulk and sealant can affect their performance, making each of them better suited for different applications.

Industrial caulk

Industrial caulk is typically a thick, paste-like substance that seals gaps and cracks between building materials such as wood, metal, and masonry. It is generally made from a combination of polymer resins, solvents, and fillers, and it hardens after application to form a waterproof and airtight seal.

Industrial caulk is ideal for filling more significant gaps and joints exposed to extreme temperatures, moisture, or other harsh environmental conditions. It can be used in various applications, such as sealing around windows, doors, and other openings and filling gaps in concrete and masonry.

Industrial caulk can also be used to reinforce joints and seams and is often used in combination with other materials to improve the durability and longevity of a structure.


Sealant, on the other hand, is a thinner substance that is applied to a surface to create a barrier that prevents the penetration of air, water, and other substances.

It is a more versatile material typically made from various materials, including silicone, polyurethane, and acrylic, and is available in multiple colors and formulations.

Unlike caulk, sealant can seal joints and gaps subject to movement, such as those found around doors and windows, without cracking or splitting.

Sealant is particularly useful in applications where a flexible, durable seal is required, such as in the construction of roofs, floors, and walls.

Key differences

Industrial caulk and sealant are different mainly due to their ability to withstand environmental factors such as temperature, humidity, and UV radiation.

While both materials are designed to provide a barrier against water and other substances, sealant is typically more resistant to extreme weather conditions. It can maintain its integrity over a more extended period.

Another difference between caulk and sealant is their application method. Industrial caulk is typically applied with a caulking gun, while sealant can be applied with a brush, roller, or sprayer.

Additionally, sealant is often used to create a smooth and aesthetically pleasing finish, while caulk is typically hidden behind other materials, such as trim or paint.

Industrial caulk is typically used for more significant gaps and harsher conditions. Sealant is typically thinner, used for smaller holes and movement, and can be applied with various methods for an aesthetically pleasing finish.

If you are wondering whether caulk or sealant is the best option for you, contact a professional at JK Industries. We will be happy to discuss your options and get you taken care of today.