How do you repair weapons?

You need to have 2 of the same weapons to repair them(this is done by pressing Y in the Pip-Boy while you have the weapon selected). Or you can use a Weapon Repair Kit, which can be bought or randomly scavenged. You will also need to have a high enough repair skill to repair weapons that are more seriously damaged.

I love the 'Repair Kit' idea. I got tired of wasting Alien Biogel to repair my Gauss Rifle in Fo3.

Uhmmmm.....yeah.....i didnt even know thats what that stuff was for. Thanks