Originally Posted by SteveH

Different functions.

Tri_Flow is a lubricant. it has a silicon base so even when it dries it leaves behind a lubricant (dry silicon)

Kroil is a penetrating oil. it's function is to seep into cracks and crevasses and soften any existing rust and/or contaminants. It is almost anti oil.

This stuff REALLY has a amazingly low surface tension... Take two flat plates of material. Put on one drop of other stuff (Tri-Flow, WD-40, sewing machine oil, etc) and on the other put one drop of Kroil. In a few hours you will see the Kroil one has spread out WAY more than any of the others. I buy mine from McMaster Carr http://www.mcmaster.com/