J-B WELD SYRINGE 25ML

It bonds metal to metal best, and also works on ceramic, brick, wood, fiberglass and most hard plastics. It is not a good choice for metal-to-glass joints, chrome under load, or polyethylene and polypropylene, which epoxy will not hold. Clean every surface with acetone and sand off paint or plating first, then leave the joint undisturbed for 24 hours.

It sets in 4 to 6 hours at room temperature and reaches full cure in 15 to 24 hours. Cold slows it down: between about 30 and 50 degrees F, allow roughly 6 to 8 hours to set if the layer is under 1/4 inch thick, and keep a small heater or incandescent lamp near the repair. Do not disturb the joint while it cures.

Fully cured, it withstands temperatures up to 550 degrees F. That is the highest rating in the syringe line. Note that J-B Weld's FAQ page rates syringes lower than twin tubes (300°F for the Original syringe), and this product is not suitable for exhaust manifolds, mufflers or headers. It neither expands nor contracts measurably as it cures. It is still an epoxy, so continuous service at the top of that range will shorten the life of the repair.

Yes. Once fully cured it can be shaped, tapped, filed, sanded and drilled, and it accepts paint better than the clear and plastic-specific products in this line. Wait the full 15 to 24 hours before machining or painting. For filling large dents or pinholes in sheet metal, automotive body filler is much easier to sand and the better choice.

No. J-B Weld products are considered non-toxic once fully cured, but none are rated food-safe and this one is not. Do not use it on dishes, cookware, mugs or any surface that contacts food or beverages, and do not put a repaired item in an oven. For a potable water repair, no product in this line carries a food-contact rating.

It resists gasoline once fully cured, but allow a full two days before fuel contact, and it is not recommended with fuel over 15 percent ethanol. It will not repair a plastic fuel tank. Those tanks are usually polyethylene or polypropylene, which epoxy does not bond to. Replace the tank or have it plastic-welded instead.

Yes. Once fully cured, J-B Weld Original can be painted with enamel or latex paints, so your repair can blend in with the surrounding surface.

Enamel and latex paints both work well over cured J-B Weld Original. Make sure the repair has reached full cure before you paint.

Apply a release agent to those areas before you start. Candle wax or Gulf Wax works well, as does a very thin coat of petroleum jelly. J-B Weld Original won't adhere where the release agent is applied.

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.