A friend of mine is in currently in the States, and it seems like a good idea to have him get stuff that is sorta rare back home. I have a Inel i5 2500k cpu running with a crappy 20 rupee paste.
Arctic MX-4 and Arctic Silver 5 are the two choices I have settled down on. Could anyone tell me which one to get between these two?
Also, will my pal be able to bring it through customs, the thermal compound being a liquid and all?
Get Arctic Silver 5 as it is the best. Please refer this: http://www.hardwaresecrets.com/article/Thermal-Compound-Roundup-February-2012/1490/5
As for the customs it is not at all completely liquid so there is no problem.OK.
100ml of liquid/gel is allowed in cabin baggage. anyways, he would be carrying it in his in check-in baggage… so no issues.
+1 for Arctic Silver 5. though apply it with caution as it’s capacitive due it which it may damage motherboard or something else if some paste falls on. Follow the instructions mentioned here for paste application patterns for different cpus: Arctic Silver Incorporated - Route to Product Instructions for Arctic Silver 5
and if possible, get ArctiClean 1 and 2 as well. these two solutions clean and prepare the surface before applying thermal paste.
Those are totally not needed. A small amount of isopropyl alcohol borrowed from local mobile repair shop is enough. That’s the way I did it. DO NOT USE nail-polish remover!
^^ next time you should try using ArtiClean “after” using IPA or your preferred solution. no matter what i use to clean the processor, ArtiClean removes some more gunk afterwards. and i checked using high-res camera and found that ArtiClean indeed cleans “some more”.
Arctic Silver 5 is electrically conductive, You need to keep that in mind, if it bleeds oer the edges of cpu, it could cause short circuit/kill th cpu. Its also a bit thicker than mx-4.
Mx-4 is easier to apply, electrically non-conductive.
@Orija - better tell your friend to get Noctua NT-H1 
Hmm, well, trying to get my friend to buy it off Amazon didn’t work so well, by the time I reached him, he was in another city.
Where can I buy a thermal paste in India from? There is the Arctice Ceramique on ebay for 750/- and the Arctic Silver 5 on primeabgb for 600/- Is primeabgb trustworthy, I live in Chandigarh, or should I buy the Ceramique off ebay?
Primeabgb is a trustworthy shop AFAIK.