SEAMWELD SYRINGE - 25ML

SeamWeld is made for bonding and sealing automotive body panel seams, where impact and vibration resistance matter more than raw tensile strength. It sets in 5 minutes, cures in 1 hour and reaches 2350 PSI tensile strength. It cures white. Because the set time is short, position and clamp the panel before you mix anything.

SeamWeld bonds metal, aluminum, plastics and composites, PVC, fiberglass and rubber, which suits panel seams that combine materials. Like all J-B Weld epoxies it will not hold on polyethylene or polypropylene. Scuff the area, remove paint and rust where you can, and clean with acetone before applying.

You can bond cloth with it, a headliner for example, but it will not look neat. SeamWeld is a structural seam adhesive, not a fabric glue, and it cures white and rigid, so it shows through fabric and stiffens the area. For upholstery and headliners, a trim or weatherstrip adhesive gives a far better result.

No. Plastic fuel tanks are almost always polyethylene or polypropylene, and neither SeamWeld nor any other J-B Weld product will bond to those plastics. There is also no published fuel resistance rating for SeamWeld. Replace the tank or have it plastic-welded. For metal fuel components, look at the Original J-B Weld formula instead.

Surface prep decides whether the repair holds. Sand or scuff the area to break any gloss, remove paint, rust and wax, then wipe with acetone and let it flash off. Both surfaces must be dry. Mix equal parts, apply within the 5-minute working window, and leave the joint undisturbed for the full one-hour cure.

Store the syringe nose-up rather than lying on its side. Keeping it upright helps prevent the tips from becoming contaminated, so the product stays ready for your next repair.