Steel armor weathering mini tutorial:
Step 1. Paint all nice and purdy.
Step 2. Toss it out your car window while doing 70 on the interstate.
Step 3. Turn around and pick it up.
Step 4. Done!
or...
Step 1. Paint all nice and purdy.
Step 2. Put it in the clothes dryer along with some rocks from the driveway/yard etc.
Step 3. Turn on the dryer for a full cycle
Step 4. Done!
...if sarcasm was not identified in this post, I humbly apologize.