This is also used to make a plate armor. Decent AC, +2 or 3 to STA and DEX (Bonus differes by armor piece), well as a +2 or 3 to Sv v. fire (IIRC)
The receipe is:
1 Sand Temper
1 Water Flask
1 Superb Leather Padding
1 Smithy Hammer (ret on success or fail)
1 Plate Armor Mold
X Folded Sheet of MQ Metal (1-3 depending on piece)
Trivs from 190-226 depending on piece.