Originally Posted by Goldenpi
Ive never heard of anyone trying this, but what about epoxy? The clear type. I have a USB card-reader with a broken case - I completely covered the exposed PCB in epoxy, to prevent it shorting on anything metal. The covered PCB works perfectly, and this epoxy lasts for years with no change beyond slight discoloration. It sets hard, resistant to accidential damage... it should be a very good condensation-proofer, except for the slight problem of being completely impossible to remove if you apply it wrongly.
the setting hard could be the problem maybe, what if you need to get your cpu out and its stuck in there like glue? your water block might even stick on if it sets hard and they are hard enoough to get off sometimes from the thermal paste.