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Could someone explain how mastery ticks? For example, lets say when I directly heal the tank for 8k, he gets the shield for 800 hp over 8 seconds, or 100hp/s. If right after that I use an instant heal which is bigger or smaller, does the tank get one tick of the shield anyways or does it get refreshed/overridden without even one tick? I'm trying to figure out how useful mastery is when you are spamming one target.
Mastery is not a HoT. It is an absorb shield, so I'm afraid I don't really understand what your asking with ticks. An 8k heal applies a 800 shield. Before the shield is used or expires, you heal the target for 2k. The larger shields duration is refreshed. You now heal the target for 25k, an new 2.5k shield will be placed on target, overwriting the smaller one.
Edit: Mastery has a unique effect per spec, Illuminated Healing produces a shield for a base of 10% on most paladin heals with an additional 1.25% per Mastery, which is not to be confused with Mastery Rating. This shield lasts 8 seconds and is refreshed by smaller shields from mastery, and overwritten by larger ones. If we assume these shields are 100% effective, Mastery will be less output then haste, but significantly more compared to crit. These illuminated healing shield are produced by FoL, HL, DL, HS, WoG, LoD, and LoH.
YOu should probably read the post before asking questions, this is a pretty clear outline of mastery mechanics.