Aluminum Foil from kitchen VS Metal Oxide Thermal CPU Paste; R/C Heli main motor (brushed)- slight gap between the motor and heatsink?

: The main motor is surrounded by a thin aluminum heatsink (no cooling fins, just flat round alum.)

but does not make very tight contact with it, there's a slight gap between the heatsink

and the brushed motor.

Would there be a big temp diff. between using regular kitchen aluminum foil to fill the gap,

such that it's worth the time, money, shipping, etc.. for this instead;

StarTech.com 1.5g Metal Oxide Thermal CPU Paste Compound Tube for Heatsink

Cooling SILVGREASE1 (Silver)