10 best automotive seam sealers
Automotive seam sealers are specialized sealant products used in the automotive industry to seal seams, joints, and gaps in a vehicle's body panels, such as the seams between welded panels or the areas around doors, windows, and trunks. These sealers serve several important functions in vehicle manufacturing and maintenance:
Waterproofing: One of the primary functions of automotive seam sealers is to create a watertight barrier. They prevent water from entering critical areas of the vehicle, such as the interior cabin, the trunk, and the engine bay. This is crucial for preventing corrosion and protecting sensitive electrical components.
Rust Prevention: Seam sealers help inhibit the formation of rust by sealing off areas where moisture could accumulate. Rust can weaken a vehicle's structural integrity and lead to costly repairs if left unchecked.
Sound Dampening: Seam sealers can also contribute to reducing noise and vibrations in the vehicle. By sealing gaps and seams, they help create a quieter and more comfortable driving experience.
Structural Integrity: In some cases, seam sealers are used to reinforce the structural integrity of a vehicle's body panels. They can help distribute stress and prevent cracks from forming in critical areas.
Appearance: Automotive seam sealers are available in various colors and formulations to match the appearance of the vehicle. This ensures that they blend seamlessly with the surrounding body panels, providing a clean and finished look.
Types: There are different types of automotive seam sealers available, including brushable seam sealers, cartridge-based sealants, and sprayable sealants. The choice of sealer depends on the specific application and the preferences of the automotive manufacturer or repair technician.
Application: Seam sealers are typically applied using specialized equipment or tools, such as brushes, caulking guns, or spray guns. The application process involves cleaning the surface, applying the sealer, and allowing it to cure.
Compatibility: It's important to select seam sealers that are compatible with the materials being sealed.For example, some sealers are designed for use on metal, while others are suitable for use on rubber or plastic components.
Maintenance and Repair: Over time, seam sealers may deteriorate or become damaged due to wear and tear or accidents. It's important to inspect and repair or replace seam sealers as needed to maintain the vehicle's integrity and protection.
In summary, automotive seam sealers are essential products used in the automotive industry to seal gaps, seams, and joints in vehicle body panels. They serve various purposes, including waterproofing, rust prevention, sound dampening, and structural reinforcement. Proper application and maintenance of seam sealers are critical for preserving a vehicle's appearance and structural integrity.
Below you can find our editor's choice of the best automotive seam sealers on the market
3M Urethane Seam Sealer, 08367, Black, 310 mL Cartridge
3M
Product description
Our 3M Urethane Seam Sealer is a high solids seam sealer ideal for sealing automotive and RV seams and joints. It adheres well to bare metal, primed metal and painted surfaces, and if desired can be smoothed to a featheredge and/or brushed. Tack free and paintable after 30-45 minutes, this urethane formula is permanently flexible and offers superior performance to solvent-based sealers.
- High quality, single component formula adheres well to bare metal, primed metal and painted surfaces
- Moisture curing property provides excellent performance in high heat and humidity environments
- Non-Shrinking, non-cracking, low/no odor formula remains flexible and offers superior results to solvent-based sealers
- Thick consistency is able to fill large voids
- Can be smoothed to a featheredge or brushed
- Paintable after 30-45 minutes
User questions & answers
| Question: | How to stop unused portions from drying out? I've had 3 half full tubes get hard during storage after blocking/covering up the hole in the past |
| Answer: | Like Badtimmy66 says put a screw in the end (make sure it's a tight fitting screw that you pretty much have to screw in but not too large it screw the nozzle up) and I also use duct tape. Put a strip over top of the nozzle from side to side then usually a couple raps around the nozzle and make sure nozzle is tight at base and mine seems to last quit awhile without digging any hard material out of the nozzle |
| Question: | Is the tip/nozzle used to dispense product included? It is shown in the picture, but not mentioned in the text |
| Answer: | Hi Jim! Thank you for your question. The 3M 08367 Urethane Seam Sealer should be packaged and shipped with the nozzle. |
| Question: | What chemical can be used on it to “smooth” after applying |
| Answer: | Thank you for your question! You can tool the 3M 08367 Urethane Seam Sealer with water or mild solvent such as a pre-cleaner. Do not tool with any alcohol containing solvents, they will stop the curing process of the seam sealer. |
| Question: | Can you sand it |
| Answer: | Thank you for your question. We like to know more details regarding your application. When sanding is involved this imposes possibility of exposed metal causing corrosion/rust. Please contact us at 877-666-2277 option 2 to discuss your application. |
3M Dynatron Auto Seam Sealer Caulk, 550, Grey, 12 oz
Product description
Dynatron Auto Seam Sealer Caulk is a fast-skinning, permanently elastic, non-sagging formulation that is brushable and paintable. Our sealer provides excellent adhesion to bare metal or painted surfaces and is a non-staining, all-purpose autobody joint and seam sealer.
- Fast-skinning
- Permanently elastic
- Non sagging
User questions & answers
| Question: | is it paintable |
| Answer: | I have a wide face also, most sunglasses don't fit me. I normally wear 55-58 in ray-ban and x-large in most others. the Julbo have 61/14 on the arm, but the fit great and I am very happy with them. |
| Question: | What is the recommended ambient temperature range for applying this seam sealer |
| Answer: | I have the polarized version, just normal dark lenses, not polished or mirrored, I have the gold mirrored versions as well. |
| Question: | Is this a polyurethane caulk ? Or what is it made of |
| Answer: | the glasses are polycarbonate |
| Question: | Is this safe to apply to bare metal or should the surface be primed first |
| Answer: | wear anywhere town country mountains cities the lenses are not too dark |
Product features
Dynatron Auto Seam Sealer Grey Caulk
Dynatron Auto Seam Sealer Grey Caulk is a fast-skinning, permanently elastic, non-sagging formulation that is brushable and paintable. This sealer provides excellent adhesion to bare metal or painted surfaces and is a non-staining, all-purpose autobody joint and seam sealer.
Details:
3M Heavy-Bodied Seam Sealer, 08308, 200 mL Cartridge
3M
Product description
Our 3M Heavy-Bodied Seam Sealer is a two-part epoxy seam sealer for all general purpose automotive sealing. It cures quickly to a tough, strong bead for lasting seam sealing protection and is used on door skins, floor pans, trunk floors, roof seams, and many other applications. Our self-mixing system ensures a proper mix ratio every time - delivering a consistent cure rate and strength.
- A high performance two component epoxy seam sealer. Black in color.
- Heavy-bodied, non-sagging, non-flowing, and easy tooling formulation for matching OEM seam sealer appearances. Appropriate for bare metal applications.
User questions & answers
| Question: | How long before you can paint it and is primer required. Thanks |
| Answer: | This is what I ordered it for. I have Corian countertops (Regretably). It didn't work. |
| Question: | Where's the nozzles? Just recieved my order and there are no nozzles. 2 stars |
| Answer: | Have you looked at the "cleaning instructions " that should have been with the leather ? I wouldn't use anything that they don't recommend. ... |
| Question: | Photo shows 2 mixing nozzles but description doesn't say. Are they included |
| Answer: | I would say no. These are much more abrasive than something like a Scotch pad. |
| Question: | Why is it a different language in the picture |
| Answer: | Only 5 single pads. Not box. |
3M Flexiclear Body Seam Sealer, 08405, 1/10 gal cartridge
3M
Product description
3M Flexiclear Body Seam Sealer creates strong and airtight seals on exterior joints and seams. Our medium-bodied sealer offers reliable adhesion on hard, impervious exterior automotive surfaces. This is a low modular sealer, a formulation which offers more elasticity for applications where flexibility is required.
- Clear, non-yellowing formula is low profile
- Low modular sealer stays flexible once cured
- Fast-drying formula may be painted in as few as 45 minutes
- Caulk style dispensing system offers convenient application
User questions & answers
| Question: | Is this product non acid |
| Answer: | I do not believe it is acid. I used it to seal seams on a trailer and it works great stays supple in heat and cold. |
| Question: | I don't understand the product description. For heavy-duty scrubbing prior to recoating. Can also be used for heavy-duty spray cleaning or foam scrub |
| Answer: | It is not for any cleaning - I believe there is an incorrect description for the product. I remember also reading that description. Try another of the ads for the product. |
| Question: | Does the tube last if stored properly? I only need a small amount |
| Answer: | Mine dried out after 4 weeks even stored correctly. |
| Question: | Does this create a permanent bond, or can the parts be separated later |
| Answer: | Thank you for your question! 3M08405 Flexiclear Body Seam Sealer creates strong and airtight seals on exterior joints and seams. Our medium-bodied sealer offers reliable adhesion on hard, impervious exterior automotive surfaces. This is a low modular sealer, a formulation which offers more elasticity for applications where flexibility is required. |
Product features
3M Flexiclear Body Seam Sealer
3M Flexiclear Body Seam Sealer creates strong and airtight seals on exterior and interior joints and seams. This medium-bodied sealer offers reliable adhesion on hard, impervious surfaces. This is a low modular sealer, a formulation which offers more elasticity for applications where flexibility is required.
3M Flexiclear Body Seam Sealer is a caulkable sealer adheres to surfaces such as primed and painted metal, glass and aluminum. This sealer dries clear and resists yellowing for a clean, low profile appearance. It uses a standard 'caulk' style dispensing system. It's fast drying and ready for painting in approximately 45 minutes.
Details:
Barrier Bond Black Seam Sealer Compound - 10.1 fl. Ounce Tube
Custom Shop
- Seam Sealer Compound is fast curing and designed exclusively for automotive uses
- This product is a one part, high performance sealant that combines high flexibility with high ultimate strength, permanent bonds and long service life.
- These products are high quality elastomeric sealants formulated to provide excellent adhesion to a wide variety of substrates and come in an easy to use, non-sag consistency suitable for easy application with a standard caulking gun in both horizontal and vertical automotive joints.
- Smooth creamy non-sag texture – easy to tool
- High rubber content, highly elastic, good low temperature flexibility
Barrier Bond Brushable Seam Sealer -Quart Can with 30.4 Fluid Ounce
Custom Shop
- Brushable Seam Sealer is fast drying and designed exclusively for automotive uses.
- This product remains flexible and will not crack, harden, sink or sag
- This product remains flexible and will not crack, harden, sink or sag
- It provides excellent adhesion, seals cracks, crevices, body seams and is ideal for use on all lap and flange seams and joints
- Brushable Seam Sealer is paintable in 30 to 60 minutes and comes in a light gray color
ACDelco 10-2013 Body Joint and Seam Filler Compound - 11 oz
ACDelco
Product description
ACDelco Medium Body Seam-Sealing Compound is a high performance seam and joint sealer with excellent adhesion to most surfaces. It is water resistant, stays permanently flexible, and withstands weathering, oxidation, salt water, gasoline, and most solvents. This product is safe to use on automotive paint. ACDelco Medium Body Seam-Sealing Compound should not be applied near catalytic convertors and mufflers, due to extreme heat conditions. For Professional Use Only, Not for Retail Sale
- For professional use only – not for retail sale
- Fast curing and skins over quickly—can be painted 60 minutes after application
- Can be used for all sealing and adhesive applications with a standard caulking gun in both vertical and horizontal joints
- Flexible, non-staining, and non-sagging product that will not crack or shrink
User questions & answers
| Question: | Did anyone else's come in a plain cardboard tube instead as pictured in the add |
| Answer: | not long. maybe a couple/few weeks. |
| Question: | Has anyone put a small amount on a panel and then try to spot weld it to the vehicle. I have a CJ that I'm replacing the cowl on an I need a small amo |
| Answer: | Make sure you NEVER wash your car with a dish washing detergent (Dawn, Dawn ultra, etc.) as these will immediately remove all wax or sealant applied to the finish. If you wash the vehicle with a car washing soap the product will last much longer. The sealant also benefits from applying a wax after the sealant for a richer looking shine but it is not necessary. The sealant provides exceptional protection for up to a year. |
| Question: | Is this product non acid |
| Answer: | Clay bar first while washing...wax ..remove wax and then apply sealant..as long as paint is clean you can wax and as wax is drying...mix in sealant...do in shade in sections/panel's |
| Question: | What color is this |
| Answer: | polish seal then wax... |
Product features
True GM Original Equipment and More
ACDelco is the true General Motors Original Equipment parts brand, infusing a century of experience, innovation and quality into more than 90,000 GM OE and other parts.
Original Down To Our Blueprint
ACDelco parts appear in more than 2 million GM vehicles each year, which makes us the only GM parts brand to offer the same Original Equipment parts shipped for GM vehicle production.
A Professional Choice
ACDelco Professional parts are manufactured to meet expectations for fit, form and function, offering high quality and great value.
The ACDelco Advantage
Our Advantage parts provide a competitively priced, yet quality alternative to unbranded aftermarket components.
It's Our Specialty
ACDelco gold-label Specialty parts are engineered to OE expectations for exceptional applications that require enhanced performance, including police vehicles.
ACDelco Chemicals
ACDelco offers a full range of oils, fluids, and vehicle care products to protect, enhance, and maintain your automobile. From adhesives, sealants, and cleaners to lubricants, waxes, and paints, ACDelco has all you need to keep your GM or non-GM vehicle looking and performing great.
3M Dynatron Auto Seam Sealer Caulk, 570, White, 12 oz
3M
Product description
Dynatron Seam Sealer is a fast-skinning, permanently elastic, non-sagging formulation that is brushable and paintable. Provides excellent adhesion to bare metal or painted surfaces and is a non-staining, all-purpose autobody joint and seam sealer.
- Brushable and paintable consistency makes applications easy
- High adhesion works on both bare metal and painted surfaces
- Fast skinning starts in about 10 to 15 minutes
- Non-sagging formula keeps seam sealer in place
- Non-staining
User questions & answers
| Question: | Can I use this to cover a hole in driver side floor for a 2013 Nissan Sentra sl |
| Answer: | Hi Sharonda! Thank you for your question. No, the 3M 570 Dynatron Auto Seam Sealer would not be the appropriate product for your application. We would suggest contacting your vehicle manufacturer for a product recommendation. |
| Question: | Will this sealant adhere well to fiberglass |
| Answer: | In my application, it did. Fiberglass to metal. |
| Question: | On the container it says white in the description it says grey. Which is it White or Grey |
| Answer: | Thank you for your question. The part number 570 would be for the white Dynatron Seam Sealer. |
| Question: | Does this "yellow" in the sun after being exposed for a while? Is it UV resistant |
| Answer: | why would it be exposed to sun?, it is a seam sealer everywhere u use it should be out of sight. just cover with paint if it is exposed |
Product features
Dynatron Auto Seam Sealer Grey Caulk
Dynatron Auto Seam Sealer Grey Caulk is a fast-skinning, permanently elastic, non-sagging formulation that is brushable and paintable. This sealer provides excellent adhesion to bare metal or painted surfaces and is a non-staining, all-purpose autobody joint and seam sealer.
Details:
Transtar 4167 Ultra Flex Black Seam Sealer - 11 oz.
TRANSTAR
Product description
Transtar 4167 Ultra Flex Black Seam Sealer - 11 oz
- Ultra Flex Seam Sealer Black, 11 oz Cartridge TRE-4167
User questions & answers
| Question: | do you have to paint it |
| Answer: | I dont think its required but it might look nicer if your vehicle isnt black. |
| Question: | Does this have to be painted within 48 hours like the directions say |
| Answer: | NOt sure you must paint within 48 hours or you can paint it within 48 hours. I painted mine several months later with no problem. |
| Question: | Can this be easily sanded or is it like silicone or rubber |
| Answer: | No it cannot be sanded. It is a urithane so it's like silicone rubber. It is more plyable than rubber but when it's sanded, it looks bad. When you apply it your finish application will be your finish look. Advise if your going to use the urithane as a seam sealer, save some money and buy door and window urithane from your local hardware store. Same stuff just cost less |
| Question: | Is this UV resistant |
| Answer: | This product is typically painted over . I personally have not used it without top coating with another product . Transtar Auto Technologies can verify the answer to your question. |
SEM 29392 Black Seam Sealer - 10.1 fl. oz.
SEM
Product description
SEM Seam Sealer is a versatile single component sealer for sealing interior or exterior seams, joints and voids. It has a flexible, non-sag formula that contains no isocyanates.
- Intense color collection that provide high visual impact
- Not compatible with synthetic enamels
- They should be applied over bright white for maximum brightness
- Remains flexible without shrinking or cracking
User questions & answers
| Question: | Can a standard Calk Gun be used to dispense product |
| Answer: | yes a standard caulking gun can be used to apply this seam sealer |
| Question: | Will it accept por15 as a top coat |
| Answer: | It probably will, however I would not recommend it. To get the most benefit from POR 15, Rust Preventative Paint it really needs to go direct to metal. Then you can apply SEM, Seam Sealer over the POR 15 after about a 3 hour dry time. |
| Question: | Does it dry glossy or dull |
| Answer: | Glossy. You can't tell whether it's dry by looking at it. it dries the same as it looks right out of the tube. |
| Question: | Is it sandable |
| Answer: | Yes, it is but depending on the thickness you should wait roughly 24 hours to fully cure. If it is thicker it will take longer. |
| Question: | if you use it on exterior (under rockers and floors) does it have to be top coated |
| Answer: | NO it can be used alone, it will skin over. |
| Question: | can I apply this over top of por |
| Answer: | I've never used por15 ,but I've used similar products & works good . |
| Question: | Can it really be applied with a brush |
| Answer: | I use a "chip" brush. I get those at Harbor Freight or a good hardware store, they are meant to be disposable, under a dollar and work excellent |
| Question: | what color is it |
| Answer: | white and is paintable |
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