3M Controlled-Flow Seam Sealer, 08329, 200 mL Cartridge, Case of 6

• APPLICATION FLOW CONTROL: Sealer only flows 1 to 2 inches on non-level surfaces
• CONTAINS NO SOLVENTS: Cured sealer will not shrink or crack
• FAST CURE TIME: Ideal for high-speed results, this sealant fully cures in just 2 hours
• HIGH-PERFORMANCE URETHANE: Forms flexible bonds that can withstand torsional stress, vibration, and weather
• STICKS TO COATED SURFACES: Formula adheres well to primed and painted surfaces

3M Controlled-Flow Seam Sealer offers considerable strength, flexes under torsional stress from vibration and withstands extreme weather. The urethane formula contains no solvents and will not shrink or crack. These characteristics make it an ideal choice for automotive applications where motion and exposure to weather are a constant factor.

Tough, Flexible and Self-Leveling
3M™ Controlled-Flow Seam Sealer uses two-part urethane technology to provide a tough flexible material for the sealing of joints on primed or painted substrates such as steel or aluminum enclosures. 3M™ Control-Flow Seam Sealer works particularly well in areas where a flowable self-leveling type seam sealer is required. It is designed to flow one to two inches and then begins to cure, preventing further flow out of the material. This feature allows the user to control the application, preventing excessive waste while maintaining a uniform film thickness even on surfaces that are not level. Typical product uses include automotive “roof ditch” applications where a flow grade sealer is required and some “trunk rain gutter” seams where the use of a standard “self leveling” sealer is unacceptable due to flow characteristics.

Our urethane base auto body seam sealer has a paste consistency and is black/amber in color. This 3M seam sealer offers a 3 minute work time, cures in 2 hours and is ready for painting in about 40 minutes, depending on environmental conditions.

Directions for Use:

NOTE: 3M Best Practice is that all sealers, unless designated specifically for use on bare metal, be applied to properly prepared automotive paint or primer.

SURFACE PREPARATION:

NOTE: Apply only to surfaces primed with a 2K urethane, 2K epoxy primer, or clean, sanded paint. Acid etch primers should never be in direct contact with seam sealer.

1. Scuff primed surface with a Scotch-Brite™ General Purpose Hand Pad (Ultrafine), (PN 07448).
2. Blow off dust with clean, compressed air and wipe with a clean, dry rag.

PRODUCT PREPARATION:

1. Insert cartridge into applicator gun.
3. Remove retaining collar and plug from end of cartridge. Discard plug, save retaining collar.
4. Extrude a small amount of product until both parts A and B dispense equally.
5. Attach 3M™ Mixing Nozzle (PN 08193) to cartridge and lock in place with retaining collar.
6. Dispense a small amount of material and discard.

GENERAL REPAIR PROCESS:

1. Extrude sealer onto surface. Allow to cure a minimum of 40 minutes before beginning the painting process.

NOTE: If sealer is allowed to cure more than 24 hours, scuff the sealer prior to any painting steps.

3M Science Meets the Needs of Automotive Professionals
3M used the technical properties of two-part urethane to create a sealer that combines toughness with flexibility. This sealer is ideal for filling channels and drip rails on all types of vehicles and recreating puddle-type seams. It may also be used to seal water leaks in drip rails and channels.

3M Controlled-Flow Model

The 3M Controlled-Flow Seam Sealer, model 08329, offers precise application control. This feature limits flow to 1 to 2 inches on uneven surfaces, reducing waste and ensuring a neat finish. The controlled flow is perfect for automotive seam sealing where accuracy matters.

This model comes in a 200 mL cartridge format, making it easy to use with standard applicator guns. Its design supports consistent application, ideal for professionals needing reliable seam sealing in automotive repairs and assembly.

High-Performance Urethane Sealant

This 3M seam sealer uses a high-performance urethane formula that forms flexible bonds. It withstands torsional stress, vibration, and harsh weather conditions, making it suitable for automotive environments where durability is critical.

The urethane base also ensures the sealer sticks well to coated surfaces like primed and painted steel or aluminum. This adhesion helps maintain the integrity of sealed joints over time, even under movement and exposure.

Fast Cure Time Benefits

The 3M Controlled-Flow Seam Sealer cures fully in just 2 hours, speeding up repair and assembly processes. This fast cure time allows for quicker handling and reduces downtime in automotive production or bodywork.

Additionally, the sealer is ready for painting in about 40 minutes, depending on conditions. This quick turnaround supports efficient workflows without compromising the quality of the finish.

Solvent-Free Durable Formula

Containing no solvents, this 3M sealer won’t shrink or crack after curing. This stability ensures long-lasting seals that maintain their protective qualities over time, even in challenging automotive applications.

The solvent-free nature also contributes to safer handling and environmental benefits. It’s ideal for use in areas where solvent exposure is a concern, providing peace of mind for professionals.

Case Pack Size Advantage

This product is sold as a case of 6 cartridges, each containing 200 mL of sealer. This pack size supports larger projects or multiple repair jobs, offering convenience and cost efficiency for automotive shops.

The case format helps maintain supply consistency and reduces the need for frequent reordering. It’s a practical choice for professionals who require reliable access to quality seam sealer in bulk.