J-B Weld Plastic Bonder 25ml Syringe 2-Pack — Black, Fast-Setting 1:1 Urethane Adhesive

J-B Weld Plastic Bonder Black is a two-part urethane adhesive in a resealable syringe that mixes 1:1 to deliver a fast-setting, high-strength bond for many plastics and coated surfaces.

Whether you’re fixing a cracked bumper, filling a plastic dent, bonding composite parts, or rebuilding trim, this two-pack offers ready-to-use 25 ml syringes designed to make mixing and repeated repairs simple. The syringe format keeps the resin and hardener separate until you need them, and the resealable cap prevents waste between jobs. The cured adhesive is black, sets quickly, and provides a strong, gap-filling result suited to DIY and professional applications.

How quickly does this adhesive set and fully cure?

After mixing the resin and hardener 1:1, Plastic Bonder begins to set in about 15 minutes, allowing you to clamp or position parts soon after application. The material reaches full cured strength in roughly 30 hours under normal conditions, so final loads or finishing should wait until cure is complete.

• Working set time: ~15 minutes
• Full cure: ~30 hours
• Mix ratio: pre-measured 1:1 in syringe for consistent results

What surfaces and materials will it bond effectively?

Plastic Bonder is formulated to adhere to a broad range of plastics and coated materials as well as many non-plastics, making it versatile for automotive, marine and household repairs. It bonds thermoplastics, thermosets, carbon-fiber composites, coated metals, fiberglass, PVC, ceramic, tile, concrete and aluminum when surfaces are prepared properly.

• Works on thermoset and thermoplastic composites
• Suitable for plastic, PVC, fiberglass and coated metal
• Adheres to non-plastic substrates like concrete, ceramic and aluminum

How strong is the repaired joint and what kind of repairs is it best for?

When fully cured, the adhesive reaches a tensile strength of approximately 3770 PSI, giving it substantial mechanical resistance for structural and cosmetic repairs. It’s ideal for filling gaps, rebuilding chipped or cracked sections, repairing bumpers and housings, and other applications where both strength and a black finish are acceptable.

• Tensile strength: ~3770 PSI
• Gap-filling capability for dents, chips and voids
• Best for structural plastic repairs and cosmetic restoration

How do I apply and store the syringe for multiple uses?

The syringe delivers matched amounts of resin and hardener for a reliable 1:1 mix. Dispense onto the included mixing tray, blend with a stick until uniform, apply to the prepared surface, and allow to set. After use, re-cap the syringe with the resealable cap to limit exposure and prevent drying, so the remaining material stays usable for later repairs.

• Dispense equal parts onto mixing tray, stir until consistent
• Apply to cleaned, dry surfaces; clamp if needed during initial set
• Replace resealable cap after use to prevent leakage and drying out

Who this is for: J-B Weld Plastic Bonder Black 25 ml syringes are aimed at DIYers, auto-body hobbyists and professionals who need a compact, repeatable repair system for plastics and coated parts. If you want a quick-setting, gap-filling adhesive that delivers high tensile strength, a black cured finish, and convenient syringe storage for intermittent projects, this two-pack is a practical choice for home, garage and workshop repairs.