Do it 1 Lb. Acid 40% Tin, 60% Lead Solder is designed for general-purpose use and is i for a variety of repair tasks including gutters, auto radiators, and filling metal seams. This solder reliable performance for these applications, but it is important to remember that it is not suitable for plumbing or electrical repairs. For those jobs, specialized solders with the right compositions should be used to ensure safety and effectiveness. follow proper safety guidelines and select the correct solder for each specific task to achieve results and avoid potential hazards. Model Number: 53050