The spread method doesn't seem to cover the whole "heatsink". This could be due to uneven surface on the CPU IHS (Heat spreader). On top of that, air bubbles might be introduced as seen from my other video (check out my list). Heatsink and IHS might not be truly flat, hence spread method may not be the best method to use.
My theory on why spread method may not be the best: http://img.photobucket.com/albums/v17...
Check my video list for more methods.