Here's Exactly When To Add Dry Rub To Prime Rib For The Best Flavor - Tasting Table
Briefly

Troy Guard, owner of TAG Restaurant Group, suggests seasoning prime rib with a dry rub about an hour before cooking for optimal flavor absorption. Simple blends of herbs and spices from stores or homemade mixtures can enhance the meat. To ensure the rub adheres properly, adding a bit of moisture like oil or mayonnaise is advised, as it helps build a crust without imparting additional flavor. This technique creates a delicious prime rib with a delightful bark.
"I like to season prime rib about an hour before cooking. An hour is enough time for the seasoning to start working into the meat while still letting that great beefy flavor shine."
"A little oil or my secret trick, mayo helps the rub stick better, which means you get a more even crust when it cooks. Mayo ... doesn't leave any flavor - just helps the seasoning hold onto the meat."
Read at Tasting Table
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