845 Solder Flux for Oxidized Metals


Use When Soldering old Copper, ZInc and Stainless Steel

The warehouse that stocks our AMG, Freund, Rau, Erdi, Express and Perkeo products will be closed from December 15th 2021 to January 3rd 2022 for the holidays. All orders placed for these products during this time period will begin shipping on January 4th, 2022.



Express Gel Solder Fluxes are designed for soldering copper, zinc and stainless steel metal roofing, wall panels and any project using these metals. Express solders are the standard for soldering metal roofing and gutters, as well as anything that needs soldering!

  • 845 Flux (Black Cap) is for use on oxidized metals. 320ml (10.8oz) bottle

Soldering new, clean metals? Use Express 840 Flux (Red Cap).

This product cannot be shipped by air, so please do not select Next Day Air, 2-Day Air or 3-Day Select.

Hawaii, Puerto Rico and other overseas Customers: UPS & FedEX will not ship this product to Hawaii, Puerto Rico or other overseas destinations with solder flux. 




Express manufactures heavy duty welding tools for sheet metal roofing, plumbing and tradesmen in the metal industry. High quality soldering irons and accessories.

Additional information

Weight 24 oz
Dimensions 5 × 5 × 4 in

Soldering Tool


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