[BrianG]

Well, the fan wings may not have as much surface area to grab on to. Also, thermal epoxy is meant for closely mated surfaces. Remember; any thermal paste/epoxy is meant only to fill in the microscopic imperfections in the mating surfaces. The Epoxy just has the added feature of being a bonding agent.

From all reports, thermal epoxy is permanent if the surfaces were clean and there was enough surface area. Sometimes, you can seperate two epoxied items by placing them in the freezer for 1-2 hours and then gently prying them apart. It's not guaranteed though. And I would NOT try this on any heatsink that is mounted directly to the FETs - the FET pins will most likely break before the epoxy does. But you could try this on a sink attached to the external case with minimal fuss as long as you don't apply too much prying force.

If you post a pic of your present mount, maybe I could offer an alternative mounting suggestion.