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Question: After using this, will I be able to save the leftover paste or do I throw it away?
Document: This thermal paste arrived the next day and I was able to finish building a machine for my friend.With it, I was able to lower her CPU temps by about 7 degrees C.Great buy at a fantastic price!
This thermal paste is really great. I used it on my coolermaster hyper 212+ to keep my overclock ed  1055t at 32 degrees celsius  at idle and  55 under full load using Intel burn  test in a coolermaster  690 ii advanced case, but most people need to understand that the type of cooler you use is more important than the paste you use.
My 2 year old HP laptop suffers from overheat shut-down, when I checked the temp it was 95C for the cpu and 90C for the GPU.I torn it down and applied the thermal paste, and then I ran the stress test using AIDA64, the temperature was 85C for cpu and 79C for the GPU, and I played 3-D games like Dirt 2 for over 2 hours and no problems at all!
I am not one to run bench marks so i am not going to rattle off temperatures that probably don't have anything to do with what particular hard ware you would be using this thermal paste on. I am just going to say that this is one of the best thermal pastes out there in terms of performance. Once you get to a certain level of quality, there really is a negligible difference between them in terms of temperatures.However Noctua Thermal Compound has a couple of features that make it rise above the competition.
ArctiClean work really good to remove the old compound.Finally I applied little thermal paste on the CPU and GPU with a credit card. Do not apply it with your hand. I started my PC and wao!! Now my idle temperature is less than 50C and while playing video its not going over 55C.Thank you Noctua to save my PC for some more time.
ive been using this thermal paste for 3 years and its never let me down. no curing time is a big plus.
Fantastic Thermal Paste, got my i5-3570k working on average of 31C Idle and around 57C with stress tests in Stock Clocks using Noctua NH-C14 with LOWEST fan speeds leaving room for OC.
The syringe method of application is a huge plus over using the traditional compounds because of the danger of applying too much paste. Also another great benefit of this paste is the fact it is conducive so you don not need to worry about misapplying the paste and increasing the heat on your CPU. Good deal.
First time switching away from Arctic Silver. I definitely don't regret it! This stuff is inexpensive (this tube is huge, and will last for at least 10 builds), easier to apply, and the cooling performance is equal or better in every case I've seen.
The debate will rage on forever about using a synthetic like this or some metal based compound like Artic Silver. I personally don't see much of a reason to use either one over the other aside from the synthetic not being conductive. Overall a decent product.
Answer: It all depends on how long you plan to store it,those always looking for max performance redo the heatsink interface every 12 months + or -.Try to store spare paste in a cool place, sealed well away from the elements.