Eastwood Tinning Butter | Universal | Lead Body Solder Flux, 1 lb Jar (31043)

Eastwood Tinning Butter | Lead Body Solder Flux, 1 lb Jar

Tinning butter is the essential first step in lead body soldering — without it, solder won't bond to bare steel. Eastwood's tinning butter cleans, etches, and tin-coats the bare metal surface so lead solder flows and bonds correctly. If you're doing lead work on a restoration, this is the jar that makes it work.

Vehicle Fitment

• Universal: Works on any bare steel panel being prepared for lead body solder — not vehicle-specific.

Why Choose Eastwood?

Washburn's Metal is an authorized Eastwood dealer. Tinning butter is the critical prep step that makes body solder adhere to bare steel.

Key Features & Benefits

• Solder adhesion: Prepares bare steel so lead body solder bonds correctly.
• Cleans and etches: Conditions the surface in one step.
• Critical first step: Applied before lead solder for proper bonding.
• Kit compatible: Used with Eastwood lead body solder kits (31124 / 31125).
• Generous size: 1 lb jar — enough for significant panel work.

Technical Specifications

• Size: 1 lb jar
• Part Number: 31043

Frequently Asked Questions

• Do I need this if I'm using lead body solder? Yes — tinning butter is mandatory for proper solder adhesion to bare steel.
• Does this work with lead-free solder too? Yes — use it before any body solder application.
• Are you an authorized dealer? Yes — Washburn's Metal is an authorized Eastwood dealer.

Explore Related Categories

Doing lead and body work? Browse our Restoration Tools and Body Panels for the rest of your bodywork supplies.

Prop 65 WARNING: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.