repasting

Repasting is the process of removing old thermal interface material (TIM) from the surface of a heat-generating component, such as a CPU or GPU, and applying fresh TIM before reinstalling the heat sink. The goal is to improve heat transfer between the component and the cooler, reducing temperatures and preventing throttling.

It is typically performed when temperatures rise, after servicing the cooler, or when upgrading or reseating components. It may also be done if the paste has dried or degraded. The procedure generally involves disassembly, cleaning, TIM application, and reassembly.

Cleaning uses isopropyl alcohol (90% or higher) and lint-free wipes to remove old paste until the surfaces are clean. Application methods vary: a small dab in the center or a thin line, depending on the design and TIM type. The aim is a thin, even layer that avoids air gaps and excess paste. Reassemble the cooler with even pressure and secure fasteners according to manufacturer recommendations.

TIM types include ceramic, metal-based, carbon-based pastes, and, in some cases, liquid metal. Each offers different conductivity and ease of use. Liquid metal conducts electricity and can cause shorts or corrosion if it contacts unsuitable materials, so it is typically reserved for experienced users and compatible hardware.

Repasting is not a universal fix for overheating; dust, poor airflow, or a faulty cooler can be the real cause. After repasting, monitor temperatures to verify improvement. Do not reuse dried or contaminated TIM.