Running hotter than usual?It might be time.
Thermal paste does not need replacing every few months, but it should be checked when temperatures rise, the cooler has been removed, or the system has run for years without maintenance.
When should you reapply?
Use this as a quick check: replace paste after a cooler is lifted. Otherwise inspect when temperatures rise, fans work harder, or performance changes.
Cooler removed
If the cooler has been lifted, clean both surfaces and apply fresh thermal material before remounting.
3+ years
For gaming PCs, laptops and consoles with years of heat cycles, check temperatures and plan a repaste if performance changes.
Temps rising
Higher temps, throttling, shutdowns, or a console fan running hard can point to paste, mounting, dust or airflow issues.
How long does thermal paste last?
These are maintenance ranges, not guarantees. Hot systems, poor airflow and repeated cooler movement can shorten the useful life of any thermal interface.
Worth checking sooner on older, hotter or heavily used systems, especially if temperatures have changed.
High-quality paste can last longer when applied correctly and mounted with even pressure.
Liquid metal, sheets and phase-change materials have different rules. Follow the product-specific guidance.
Signs it may be time to repaste.
Look for temperature changes, louder fans, performance drops or visible paste breakdown when the cooler is removed.
The CPU sits warmer than usual even when the system is doing very little.
Clock speeds drop under load because the CPU or GPU is hitting thermal limits, or the system gets loud quickly.
A gaming PC, workstation, laptop or games console that has run for years without a repaste is worth checking.
Unexpected restarts, overheating warnings, or a games console fan running aggressively can mean cooling needs checking.
When removed, old paste may look chalky, patchy, cracked or separated.
Disturbed paste can trap air gaps. Clean and reapply before reinstalling the cooler.
Replace, check, or leave it?
Use this section to avoid unnecessary work while acting quickly when there is a real cooling issue.
Start with the symptom, not the calendar.
If temperatures are stable and the cooler has not been disturbed, you may not need to do anything. If temperatures have increased, the cooler has been removed, or the paste is visibly dry, replacement is the safer route.
If it needs replacing, do it cleanly.
Clean both contact surfaces, apply the correct amount and remount the cooler with even pressure.
Power down
Shut the system down, disconnect power and allow the cooler and components to cool.
Remove cooler
Loosen screws gradually in a diagonal pattern. If stuck, twist gently rather than pulling hard.
Clean surfaces
Clean the CPU IHS (integrated heat spreader) and cooler base with isopropyl alcohol and a lint-free cloth.
Apply material
Use the correct amount for the CPU size and follow the specific guidance for the product you are fitting.
Test temps
Boot the system and monitor idle and load temperatures to confirm the cooler is seated correctly.
What should you use next?
Choose the material that matches your system, experience level and performance requirement.
Best for most users
Simple, safe and suitable for most CPU, GPU and laptop repaste jobs.
Paste-free route
KryoSheet, PhaseSheet PTM and Carbonaut avoid paste, but each needs its own fitting method.
Ready to repaste? Choose first.
Pick the right thermal material, then use the application guide to fit it correctly. Genuine Thermal Grizzly products, UK stock and clear fitting guidance.