Seal Methods specializes in manufacturing of Gaskets, Seals, Tapes and Precision Die Cuts. We also offer rapid prototyping to help in your design process. Utilizing CNC cutting services, this is often available at no charge to you! In our 50 years, our capabilities have expanded beyond just die cutting and laminating. We offer water-jet, laser, reciprocating knife cutting, foam-in-place (FIP) and so much more. Additionally, our diversity has brought us to manufacturing of injection molded and extruded parts that largely compliment traditional die cut gaskets and seals.

We help solve issues and we partner with many markets making SMI one of the most capable and competent manufacturers in the world, we are positioned to meet your full end-to-end production requirements. Our turnkey services include custom assembly, kitting, and private label or bulk packaging.

OEM Automotive.

We maintain a leadership position as a supplier for the OEM Automotive Market. Our manufactured products can be found throughout automotive applications from air bag inflators, seat belts, interior noise and vibration and exterior components. SMI manufactures parts that are used bumper to bumper and we have the material knowledge and fabrication skill to help you design the best products for your application...


We provide builders with products designed to protect, seal, insulate, and reduce sound and thermal transmission. Our broad line of products are ideal sealing solutions for hundreds of construction applications. We are experts in the window and fenestration markets. Glass pads and glazing tapes are our specialty.

Electric Vehicle

We specialize in Electric Vehicle Components because we are the world’s most comprehensive specialty components fabricator and leader in die-cut solutions. Our diversified manufacturing technologies allow us to service the automotive market with a wide range of solutions. We supply finished components manufactured from foams, elastomers, composites, films, high-performance gasket materials, graphite, and plastics, as well as pressure sensitive tapes, adhesives, and other specialty materials.


Our impressive mix of manufacturing capabilities combined with a deeply knowledgeable engineering and production team make us a leading solutions provider to the electronics industry. We offer an extensive range of custom products for thermal management, EMI/RFI shielding, electrical insulation, bonding, gasketing, and sealing of sensitive electronic devices and assemblies. As a full-service provider, we also produce die cuts, laminations, tapes, and other items for traction, masking, protection, and venting.

Automotive After Market

We have been manufacturing high-performance aftermarket engine and drive train gaskets since 1974. Gaskets and seals for the automotive, motorcycle, diesel, and marine markets are at the heart of our business and we remain a leader in the manufacturing, private labeling and kitting of these components that are built to our customers’ requirements. Our products are able to stand up to the punishing high temperature environments these applications face.

General Industrial

We are a key supplier of products to all major industrial markets. Our state-of-the-art manufacturing facilities offer automated, high-speed rotary and flat-bed die-cutting equipment, numerous converting lines, as well as a Class 100 cleanroom. Our robust manufacturing and quality systems emphasize continuous improvement, and environmental stewardship, and are ISO/IATF 16949 registered.


We have been a trusted medical converter for the medical, healthcare, and personal care markets for more than 30 years. Our industry-specific, state-of-the-art-solutions provide an uncompromising level of performance in a competitive market characterized by fast-paced innovation and changing consumer preferences.

Energy Storage

We are at the forefront of the lithium-ion battery movement. These battery pack assemblies offer many areas where SMI can help. We make gaskets, seals, cushions, spacers, fire block insulators, thermal run-away protection and more.


We make many components that are used in the Aerospace market. Whether it be hi-performance tapes or films or intricate die cut shapes, SMI can custom fabricate for your application. Rubber molded and extruded parts are also our specialty. All of these products are used throughout!

Alternative Energy

With growing demand for clean energy production, SMI is helping producers of this technology by manufacturing the components that are key to the assembly process. Gaskets, bonding, tapes, surface protection are just some of the products we make for this growing trend.


There are multiple applications where lighting assemblies depend on gaskets, seals, tapes and die cuts. From simple die cut foam seals, to hi performance gasket materials for outdoor abuse, SMI has you covered. Die cut bonding tapes and custom molded seals are all popular options from SMI too.


SMI technical sales experts are well versed in the broad applications of the transportation market. Truck, trailer, bus and RV all depend on SMI for hi performance tapes, precision die cuts, extruded profiles, molded shapes and so much more. We help in applications from bumper to bumper!






With a total of 4 facilities in North America, SMI has grown to 150,000 square feet of manufacturing space to perform for you!
HQ/ Southern California, Northern California, San Marcos Texas, Querétaro Mexico and China.

SMI Videos & Learning.

Blog / SMI News.

Visit our Blog and get the latest news about Seal Methods and the fabrication manufacturing industry. We highlight current trends and how Seal Methods is the premier fabricator on the leading edge in......

Seal Methods Inc

Celebrate 50 years with Seal Methods Inc.

It is with great pride that we at Seal Methods Inc. announce our 50th anniversary. As part of this momentous event, we are also excited to announce the launch of our redesigned website. Since our...


Seal Methods looks to the future and celebrating the past 50 years

Happy New Year!  As we reached the end 2023, Darin Welter, President, Seal Methods Inc., sat for an interview to reflect on all the accomplishments of the last year and how he is looking...




Seal Methods Inc. is an ISO 9001 / IATF 16949 registered company. Our quality assurance department is trained to meet the stringent requirements of ISO certification and more......


Seal Methods is one of the most diversified materials converters in the country with multiple facilities around the world. We’re growing and we’re looking for great talent. Whether you’re just launching your career or are an experienced professional, if you’d like to join a team where your innovative thinking, customer-centered attitude, and excitement about contributing are rewarded, we want to hear from you.