workshop
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That said, I have done builds where the ESC was entirely within an enclosed body or dome, the way I dealt with the cooling issue was to remove the shrink wrap and use some Arctic Silver thermal epoxy to attach heatsinks to the FETS then recover with shrinkwrap after which I cut away the area covering the heatsink. In the four multis I currently have setup that way the ESCs stay well within operating temps even under heavy use in 90 plus degrees ambient temperatures. They do get hot but not nearly as much as if they had no heatsink and remained wrapped in plastic.
Great solution. A safe method is to remove just the center section of the heat shrink with a hobby knife so that it retains the original AL heatsink that is affixed to the rows of FETs. Silver epoxy a copper chip cooling heatsink (Oxide sells some great ones - for cooling chips on PS3, etc.) and you're good to go!
jeffparisse