Make one side of your enclosure metal and mount the MOSFET on the metal. Then you can pot the entire inside of the enclosure. With the IRLB3034PBF that should be enough of a heat sink.
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Make one side of your enclosure metal and mount the MOSFET on the metal. Then you can pot the entire inside of the enclosure. With the IRLB3034PBF that should be enough of a heat sink.