Jeremy,
I recommend applying mineral oil only...no wax. Put a very generous amount on top, not on the bottom. Keep applying generous amounts of oil until you see it start to seap out of the bottom. That's when you know it's penetrated all the way through. This should take 10-20 min. Now wipe off and let them set for a few days. They re-apply oil but this time to both sides. Apply until it will not hold any more. If you have time, re-apply again in about 1 month.
Over the next year, tell you gift recipients to apply mineral oil every so often....typically about 1/month for a few months and then 2 times a year will probably be enough for regular home kitchen use. The oil sets up in the pours and eventually, over time, it can actually be washed and soaked in water without water penetrating the pours. Soaking in water is not recommended, but a properly oiled end grain board can handle the abuse and is very functional.
Consider including O&M instructions as well as a bottle of oil wiht the gift.
BTW - Nice work for a beginner boarder
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