Auto parts stores ussally have good paper. Mine stocks up to 1400 IIRC.
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Seeing as the cores are not perfectly flat, you need to use some sort of goo. No matter what. Actually the pits in a core are quite big, so artic silver of some sort is recomended. So if you have a gritty substance (Artic silver) and tried putting a mirroed finish cover over it, wouldnt that (For argument sake) lift the mirrored surface off the core? So why not have 2 roughter surfaces so that the artic silver could effectivly fill both surfaces, bringing them closer.
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Very good point. I once looked at a Duron under a steromicroscope and was amazed how rough the surface is. Unless you lap the core, I think a SMALL amount of compound will always be needed.