No, you don't need to re-paste the block.
No, you don't need to re-paste the block.
Sure, I think it would help to apply the paste. There’s plenty of it available, but we need to avoid trapping air in the hole and prevent any hot spots. Do you have a good quality one on hand?
It’s not necessarily harmful, but you should consider the method and context. Some opinions vary based on what you’re doing.
Sure, it’s generally safe to turn it on and off to test it, but results may vary depending on the device.
Trapping air isn't ideal when you separate and reassemble it—it keeps air trapped. Air has poor thermal conductivity, which is not desirable. When using the cooler, secure it firmly and use it. You can remove it later if you wish to inspect it. It's yours. Just remember to grab some thermal paste beforehand so it's ready when needed.
It's acceptable, though it won't improve things much. I've tried it several times and everything has functioned well so far. Just put the cooler on and perform a stress test to check the temperatures. Then you can return to the forum and ask about the temperature readings if you're still unsure.