sites for lapping?

[AlanSr]

I'm looking for some sites to buy some 1500 or higher grit sandpaper. I bought some 1200 girt today but I want a lil higher

[Bluesmoke]

Originally posted by AlanSr
I'm looking for some sites to buy some 1500 or higher grit sandpaper. I bought some 1200 girt today but I want a lil higher


I actually read an article here in the Heatsink reviews and tips section articles about how you might actually decrease the cooling efficiency by lapping TOO WELL! see "Why Heatsink Polishing Might Be A Bad Idea" That article recommended not going higher than 600 grit.. I don't know,,, I'm not the guy who wrote the article but he made some sense.. I only went as high as 800.. My temps are not too bad 96F no load to about 122F under heavy load with a room temp of 68F. I'd like to see some comparisons to see if it really might make a difference good or bad... I used Lapping guide on Wildandy C's site and it only mentioned 800 grit as the max.

As for places to get the higher grades I had to go to an industrial hardware stores.. Most normal hardware stores did not go higher than 400 from what Ii found..

[AlanSr]

cool thanks for the input,

now I'm tryin to decide weather or not to use mothers polish after lappin, I get mixed reviews on it.....about 50% say yes and 50% say no.
since this is my first time lappin I'm going to be very cautions

[JaY_III]

i would stick with the 1200 grit paper...
thats all i used. any more and your thermal paste will not be able to fill in the small gaps.

If you still want 1500, try an Auto body shop. They use high paper like that for detailing cars.

[AlanSr]

do you suggest useing polish "mothers aluminum polish" because I keep gettin mixed opionions on it.

[Patchmaster]

The thermal compound is supposed to fill in all the microscopic nooks and crannies on the surface of the heatsink. If you use any kind of polishing compound, it's going to fill in those spaces and make it very tough for the thermal compound to displace it. Unless you think the polishing compound will transmit heat better than your thermal compound, I'd advise against it.

I recommend going to the Arctic Silver web site and reading their instructions for applying AS II. Even if you don't use AS II, the instructions will give you some insight into what thermal compound is supposed to do and how to properly apply it.