Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Plate Scraps + Durable Metal Armour

of Water Resistance = no change to the armour and the scraps are gone.

I should get "Boosted Durable Metal Armour ...".

It does not actually add Boosted to the name, it simply boosts armor. If your armor already had a boost roll as high or higher than your crafting could apply then it won't make a difference.

In that case the game should not open the crafting window because that is probably what happened here.