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Start Your Project Guide

Our easy four step selection guide takes the guesswork out of choosing the right solder for the job. Ensuring the success of your repair or build is dependent on Four factors:

  1. Describing your project. What you are trying to achieve and the attributes that are important to make your project a success.
  2. Correct Identification of the metal(s) being joined.
  3. Matching the correct product(s) for the metals used and the project.
  4. And, applying the proper technique.

Taking a few moments to follow these simple steps ensure success and save time. GET STARTED NOW.

Solder Direct has a variety of products, one just right for your project. Choosing the right solder, flux and soldering technique starts with defining what you are trying to do. From plumbing projects to repairing a propeller for your boat, from electrical and electronic applications to repairing a vase for your home, you can count on Solder Direct to provide what you need for a successful project.


Solder Direct offers Kapp solder and flux, your best choice for all copper to copper, copper to brass, and brass to brass plumbing. Typical applications are the joining of copper pipe to copper pipe and copper pipe to brass fittings. Kapp Zapp and Kapp Free solders are both certified potable. Be sure to identify the correct metals to be used for the best solder and flux match for your project.

Electrical/Electronic Applications

Soldering electrical and sensitive electronic components requires a lower melting point solder. Solder Direct offers a variety of solders that provide control in tight applications and can hold a strong bond while being subject to vibration. Solder Direct offers solders for Aluminum to Aluminum, Aluminum to Copper and Copper to Copper Electrical/Electronic applications. Be sure to identify the correct metals to be used for the best solder and flux match for your project.

Aluminum Repair and Applications

Solder Direct is your one-stop shop for aluminum repair projects. Whether your project entails affixing aluminum pieces together, fixing a cracked surface or building up a worn-out surface Solder Direct has the best solder options for your project.

Galvanized Steel Repair

Solder Direct offers the perfect solution for repairing the surface coating of galvanized steel. If you have recently welded a galvanized steel item our solders can be used to provide corrosion protection with a new galvanized surface.

Auto Body Repair

Solder Direct offers a superior auto body filler solution. Unlike plastic fillers and fiberglass alternatives our auto body filler solution is more durable while eliminating the safety issues of lead fillers used in the past.

Household Items

Solder Direct has the perfect solution for many household repairs. Our customers regularly use our solders to: repair broken trophies, metallic vases, repair bent and broken fan blades, and make electrical connections in appliances lamps and switches.

Automotive Parts

Solder Direct offers a variety of solders that are ideally suited for automotive restoration and repair of metallic parts not suited for welding. Count on our easy to use solutions to make reliable repairs such as: repairing broken door handles and window cranks, broken mirror frames, brackets, latches, electrical connections, and radiators among others.

Marine Parts

Solder Direct makes many marine repairs and projects simple. We offer a variety of solders just right for your application. We offer solders to: repair propellers, port frames, signal light frames, speaker wire, electrical connections, electronic connections, radiators, and other uses.

Matching the correct solder to the metal(s) you are using is the most important step in the selection process and the success of your project.


Aluminum is light weight and usually has a dull, even, silver surface. An Aluminum tab or connector will scratch with a Stainless Steel brush or sand paper and the revealed surface will be shiny and silver in color. Freshly stripped insulated Aluminum wire is light weight, bright and shiny. Aluminum tubing is usually dull silver with an even oxide coating.

Diecast, White Metal, or Pot Metals

Diecast, White Metal, or Pot Metals are usually casted parts with a dull, even, silver to grey surface. They may be plated or coated with shiny gold, brass or silver finishes, but underneath are rough gritty casted parts. Examples include engine valve covers, boat propellers, marine and car door hardware, older appliance hardware, and almost all trophies and metal awards.


Copper is heavier than Aluminum and can range in finish just like a penny – from shiny and new to a very dark brown. The dark brown coloration is the oxide coating that must be broken to form a good solder bond. Freshly stripped Copper wire is usually bright and shiny like a new penny. Copper tubing may be rigid or flexible, but is always smooth.


Brass connectors are sometimes used in heavier electrical connectors like large cable connectors. These are usually red to golden in color and have a rough finish from the casting mold. Brass piping and fittings may be shiny and smooth or dull and rough, but are always stiff. Brass pipe is difficult to bend without kinking and/or cracking.

Pre-Tinned Copper or Brass

Pre-Tinned Copper or Brass is heavier than Aluminum and usually has a rough silver colored finish. This is a coating of solder applied to the Copper or Brass to prevent oxidation and promote a better solder connection. If you scratch this surface, you should be able to see the Copper or Brass color underneath.


Galvanized or Uncoated Steel pipe is usually not soldered, but is threaded and joined by threaded connectors or welded. We do not make solders for uncoated Steel because the joints are inconsistent and unreliable. We do make solders for repairing the Galvanized coating on Steel parts, once they have been joined by welding or threaded connectors.

Stainless Steel

Stainless Steel comes in wire, rod, pipe, tube and sheet form. It is usually non-magnetic and often has a dull brushed silver finish. Stainless Steel alloys with high Nickel or Chromium contents can be very shiny and have a mirror finish. These highly polished alloys are much more difficult to solder due to a very strong oxide layer. They typically require the oxide layer to be physically broken by wire brushing or sanding, AND chemical removal of the oxide layer by acid flux.

For even more specific assistance, please try the Solder Selection by Project page or the Frequently Asked Questions/Projects of the Month page.

Aluminum Diecast Copper Brass Stainless Galvanized
Aluminum Aluminum to Aluminum --- --- --- --- ---
Diecast Aluminum to Diecast Diecast to Diecast --- --- --- ---
Copper Aluminum to Copper Diecast to Copper Copper to Copper --- --- ---
Brass Aluminum to Brass Diecast to Brass Copper to Brass Brass to Brass --- ---
Stainless Aluminum to Stainless Diecast to Stainless Copper to Stainless Brass to Stainless Stainless to Stainless ---
Galvanized Aluminum to Galvanized Diecast to Galvanized Copper to Galvanized Brass to Galvanized Galvanized to Galvanized ---

Proper technique is the last step in ensuring the successful completion of your project. Once you have selected the best solder for your project and the metals to be joined, our step-by-step instructions will make it easy to achieve the desired outcome for your project. Simply identify the metals to be joined, the selected product and download your copy now.