Charlie, Thank you for your reply and your recommendation. The continuous wattage applied to the pictured resistors will be limited to about 30% of their rated capacity of 100 Watts each. These resistors are designed to be mounted on external heat sinks even though they do have limited heat dissipation ability without doing so.
The external heat sinks are intended to reduce the resistors' internal operating temperatures to safer levels and prolong their service life by providing additional means of heat dissipation. Heat transfer from the resistors to the sink is significantly improved by a thermal conducting medium to fill any tiny gaps in between them.
Any additional recommendations about whether thermally conductive silicone tape or thermally conductive epoxy has better long term durability are welcome.
