I would not trust JB weld. Drill the heatsink. Not even sure I'd trust the plastic screw inserts long term. Don't know how much your heatsink with LEDs weighs, but the extra security of a few good quality scews through the hood & secured with nuts would be my choice. Last thing you need is to come home to your LEDs with heatsink submerged in the display. Paint the protruding hardware black & it will hardly be noticed.
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