Discover the Versatile Use Cases of Permatex Prussian Blue
Apr 18th 2025
Permatex Prussian Blue is a high-quality Prussian Blue marking compound that is used to obtain accurate and reliable results when testing the flatness and tightness of machined surfaces. It is a product that is ideal for use in manufacturing plants, machine shops and automotive workshops where precision is crucial. In this guide, we will discuss the various use cases of Permatex Prussian Blue and how to use Blue effectively to achieve your desired results.
The versatility and consistent performance of Permatex Prussian Blue have made it a staple in industries that demand high accuracy in assembly and inspection. Whether you're maintaining heavy-duty engines or fine-tuning industrial machinery, this marking compound can be an essential tool in your diagnostic and quality assurance processes.
Benefits
One of the most significant benefits of Prussian Blue Permatex is its ability to produce clear and visible marks on metal surfaces without damaging the surface. The product is an oil-based paste containing fine particles of color blue powder, which is a dark warm-toned blue pigment commonly used in printing ink, paints and coatings. The paste is easy to use and can help you obtain accurate results in various applications. Because the dye used is easy to see, yet non-permanent, Permatex Prussian Blue is the ideal choice for manufacturing and other industrial uses.

Permatex Prussian Blue also has excellent spreadability, requiring only a small amount of product to cover a large surface area. This makes it highly economical, particularly for operations that require repeated or large-scale testing. The formula resists drying out too quickly, allowing for extended working time during applications that require precision and multiple passes.
Technicians appreciate the ease of cleanup, as the compound can be wiped away with a rag or solvent without leaving behind residue or causing damage. The combination of visibility, easy cleanup and efficiency makes it a top choice for both novice users and seasoned professionals.
If you're looking for a reliable source to purchase Permatex Prussian Blue, we recommend checking out Henkel Loctite Permatex No. 35 Prussian Blue on SkyGeek. This 0.75 fl oz tube of gear marking compound Permatex Prussian Blue is an excellent option for those who require a high-quality marking compound with all of the features of a traditional gear marking compound. The Prussian Blue compound is sold by SkyGeek, a leading supplier of aerospace and industrial equipment, and available for purchase on their website.
SkyGeek ensures that all products, including Permatex Prussian Blue, are stocked and shipped with quality control in mind, offering peace of mind for professionals who can't afford delays or performance issues. Whether you're ordering for routine maintenance or specialized repair, SkyGeek's streamlined logistics make it simple to get what you need - fast.
Now, let's take a closer look at the various use cases of Permatex Prussian Blue:
Flatness Testing
Permatex Prussian Blue is an excellent product for flatness testing. It is easy to apply and delivers consistent, reliable results. What is Prussian Blue used for? Prussian Blue can be used to show high spots and other imperfections on a machined surface that can affect the part's performance. To use Prussian Blue for flatness testing, the paste is applied to the surface of one part and the mating part is rubbed against it, leaving a visible blue mark that indicates the areas that need to be worked on. The process can be repeated as many times as necessary until the desired flatness is achieved.

Tightness Testing
Permatex Prussian Blue is also ideal for tightness testing. It is used to check the fit between two mating parts, such as bearings, gears and valve seats. When applied to the surface of one part, the paste then transfers to the mating part, leaving a clear indication of the contact area. The technician can then determine if the fit is too loose, too tight or just right. Again, the process can be repeated as many times as needed to get the ideal fit.
Inspection
Permatex Prussian Blue can also be used for general inspection purposes. The paste can be applied to a surface to reveal small cracks, pits or other surface defects that may affect the part's performance. This is especially useful in the automotive or aerospace industries, where engine parts must be thoroughly inspected for any signs of wear and tear. Using Permatex Prussian Blue for inspections offers the ability to visually identify and correct small defects that would otherwise be difficult to see.
Alignment
Permatex Prussian Blue can also be used for alignment purposes. When applied to the surface, the paste can help technicians align different parts of a machine or assembly. This is especially useful in the manufacturing industry, where precision alignment is essential for the proper functioning of the machinery. Because the paste is non-damaging and non-permanent, Permatex Prussian Blue can be used to align vehicle components, machine components and more.
Permatex marking compound is especially helpful during reassembly processes, as it helps ensure that all contact points are properly aligned and seated before final torquing or fastening. This minimizes the risk of damage from misalignment, improves efficiency and helps maintain performance standards over time.
Other Applications
Apart from the above use cases, Permatex Prussian Blue has several other applications, including:
- Checking the wear of engine valves and valve seats
- Identifying high spots on brake drums and rotors
- Testing the flatness of granite and marble surfaces
- Inspecting the fit of threaded parts
The blue marking compound can also assist in prototype testing, allowing engineers and machinists to validate design tolerances quickly before moving forward with production. For those working with legacy machinery, it offers an efficient way to troubleshoot irregular wear patterns and identify root causes without disassembly.
Whether you're testing for flatness, tightness, wear or alignment, Permatex Prussian Blue is a versatile and reliable product that can help you achieve accurate and precise results in your operations. The blue marking compound is easy to use, produces clear and visible marks and is versatile enough to be used for various applications. We recommend purchasing Henkel Loctite Permatex No. 35 Prussian Blue on SkyGeek for a high-quality marking compound that can meet all your needs.
If you have any questions or comments about Permatex Prussian Blue or its various use cases, please feel free to contact us. We would be more than happy to assist you.