Petra, here is some additional information you might want to include in the armor refining article. Note that there are two things that need to be re-confirmed to make sure they didn't change.
The application of plating, thread, or resin to a piece of armor MUST be done at a particular NPC shop and, again, requires GM-level crafting skill of the appropriate type. If you are in the Trammel facet, you apply plating at The Hammer and Anvil shop in Britain, near the conservatory; you apply thread at the Adventurer's Clothing tailor shop in Trinsic; or you apply resin at the Bloody Thumb Woodworks in Yew. If you are in the Felucca facet, you apply plating at the Armour's shop in Cove; you apply thread at the Stitch in Time in Ocllo; or you apply resin at the From Tree to Yew carpenter shop in Jhelom. Inside each of these shops, you will find an "Armor Refiner" NPC. Clicking on the NPC brings up a gump with some basic information about armor refinement.
Each shop has a small area that extends to the front and back of the shop by a few tiles where you can stand to do the refinement (the "armor bonus region"), so you don't have to be inside the shop when you do refining. (When you mark a rune at any of these shops and if you are standing within the specified area, the rune will likely be marked to say something like, "Armor Bonus Region - Carpenter (Felucca).") If you are standing outside that bonus region and try to apply a refinement by clicking on a plating, thread, or resin, you get a message that tells you that you will have better luck if you go to "XYZ Shop," so just move in closer to the shop (or go to it if you're not already there) and try again. If you're inside the appropriate bonus region, you will get a confirmation gump after first clicking on the plating, thread or resin and then targeting the piece of armor you want to apply it to. Click Yes and you will get a message that you've applied the refinement to the armor. You can be hidden and stay hidden while applying a refinement at a shop. (This last sentence needs to be confirmed to make sure nothing changed from a month or so ago. )
You can apply armor refinement to armor pieces that were previously crafted or enhanced out of special materials and/or that have been imbued or to looted armor pieces, but only if they aren't already meddable or have the mage armor property on them. You can imbue or enhance nonmeddable armor that has already been refined (e.g., bump its resists) without losing the refinement modifications. However, you cannot have a mage guildmaster add the Mage Armor property to a piece of nonmeddable armor that has already been refined. (I want to double-check this last sentence, Petra. I think it is correct but have not re-checked it.)
