I’ve done it so far in maple (has to be solid wood, not ply) and the machine has this as stock settings in the GFUI so just trust it (obviously test, use the LPI to burn deeper). I am betting some other hardwood (say oak) would work. Obviously you can stain/polyurethane after to weatherproof it. I’ve done engraved red oak signs with shellac and they’ve lasted years. I just used basic red oak boards from Home Depot. While I have engraved cedar back in the PRU days, to describe it as smoky would be a gross understatement and it would likely burn in a deep engrave.
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