What I found reading about Coollaboratory Liquid PRO thermal compound:

DO NOT USE ALUMINUM COOLERS
or allow Liquid Pro to come in contact with any aluminum, or other non-copper surfaces. Aluminum is not resistant against Liquid Pro and will result in damages to any aluminum surface. Aluminum will dissolve when in contact with Liquid PRO.

AMD CPUs use a Zinc-coated Copper Heat Spreader and therefore are perfectly safe to use.

What about Intel CPU's? Is it safe to use?