How can a plumber prevent a strap wrench from slipping during use?

Applying rosin to the gripping surface of a strap wrench effectively enhances its grip by increasing friction. Rosin is a sticky substance that helps to prevent slippage between the strap of the wrench and the object being worked on, such as pipes or fittings. This increased friction allows for a more secure hold, which is particularly useful when dealing with stubborn joints or when additional torque is required to loosen or tighten fixtures.

Using grease would reduce friction, making the wrench more likely to slip, while overly tightening the strap could damage both the wrench and the object being clamped. Instead of using a larger wrench, which might not fit the space or could complicate the maneuverability, applying rosin provides a practical solution to improve the effectiveness of the strap wrench during plumbing tasks.