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🚗 Seal it fast, seal it right — the pro’s choice for flawless auto seams!
3M Dynatron Auto Seam Sealer Caulk 550 is a 12 oz grey, fast-skinning, brushable, and paintable sealant designed for autobody joints and seams. It offers excellent adhesion to bare metal and painted surfaces, cures fully in 24 hours, and resists sagging and dripping. Waterproof and non-staining, it’s a trusted industrial-grade solution favored by professionals for durable, clean, and long-lasting seals.
| ASIN | B005RNFBMC |
| Best Sellers Rank | #49,823 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #156 in Adhesive Caulk #311 in Industrial Sealants #23,897 in Hardware |
| Brand | 3M |
| Brand Name | 3M |
| Color | Grey |
| Customer Reviews | 4.6 out of 5 stars 1,143 Reviews |
| Full Cure Time | 24 hours |
| Included Components | Dynatron 550 Auto Seam Sealer Grey Caulk - 12 oz. |
| Initial Hardening Time | 15 minutes |
| Item Form | Paste |
| Item Type Name | 3M Dynatron Auto Seam Sealer Caulk |
| Item Weight | 12 ounces |
| Liquid Volume | 12 fluid ounces |
| Manufacturer | 3M |
| Material Type | Rubber, Silicone |
| Model | 550 |
| Number of Items | 1 |
| Part Number | 550 |
| Surface Recommendation | Metal |
| UPC | 076308005504 |
| Unit Count | 12 Ounce |
| Warranty Description | As labelled |
| Water Resistance Level | Waterproof |
N**E
Did its job!
My husband bought this for his floor pans he welded in! Good value for the money, good quality, not sticky, smooth, looks good, and great sealability! He was pleased!
J**S
WORKS FINE
USED IN RESTORATION WORK ON CLASSIC CAR, REMOVED OLD SEALER FROM WELD AND BOLT TOGETHER SEAMS ON FENDERS AND TRUNK WITH SCRAPPER AND WIRE BRUSHING. WENT ON SMOOTHLY AND FILLED SEAMS USING HAND CALKING GUN, NO PROBLEMS. NO LEAKS TO WORRY ABOUT FOR DECADES TO COME. 3M HAS A GREAT TRACK RECORD YOU CAN TRUST.
R**.
Does the job to seal leaks
Used this to seal some weld seams on my truck that were leaking. Applies with good consistency, dries pretty quick and can be painted to match if you wish. Does the job well!
C**D
ok
Ok
J**N
Applies smoothly, dries-stays flexible, easy to work-with
It is a high-quality sealant. it remains flexible and dries well. It flows easily from the cartridge and is workable. The excess peels are easily too.
D**L
3M quality
Does what it’s supposed to, used wax and grease remover with an acid brush to spread the beads after applying the product. This was used primarily to seal up exterior panel seams of panels that were welded in on my restoration project. Works best if you can use the whole tube in one go, if not the store in a ziploc bag.
L**.
Cheap, easy to work with.
Seems like good value for the money. I was applying to the underside of my car so it was important that it didn't run, which it didn't. Was very easy to work with. Stuck to the car without sticking to my glove too much while applying.
T**Y
Works great!
Strong hold, does have a strong odor when applied, clears up when dried.
Trustpilot
1 month ago
1 week ago