Cameron said:
By one weapon, then all instances of it is affected.
... so long as you're using the gauntlets, yes.
If you aren't using the gauntlets (e.g., you're wielding a two-handed sword at the same time and decide to kick as your US), then your unarmed strike isn't affected. If you elect to use a hairpin as an improvised tool to pick a lock in order to show off to your Rogueish apprentice, you don't get the +2 Circumstance bonus and the +5 Competence bonus from your Master Thieves' Tools on your Disable Device roll. Why is this any different?
Note that, just in case it ever becomes important, I also allow helmets to do the same thing for headbutts, steel shoes (like in the heavier armors) for kicks, etc.
Generally, however, this is never an issue because people rarely make unarmed strikes without the IUS feat, thus negating the whole reason for using the gauntlets in the first place.
Can I attack with a dagger, and do slashing damage?
Then, next round, can I attack with the same dagger, and do piercing damage?
If it is a *class* of weapons, then different instances can have different effects,
Where is
this rule found? Page number or SRD link, please.