I noticed a few questions on aging steel..... This is a pretty standard finish i apply to all my outdoor work and most of the indoor. Not only does it give it a nice aged look but it also helps with covering up any large weld joints or grind marks. It is also an excellent weather barrier for rust issues. After the piece is complete i sand everything possible then clean with a "hot" laquer thinner. Next i usually apply a auto body filler such as bondo or a 3M glaze to seal all the joints and cracks. Let it dry then sand all that again and clean with the laquer. the rough texture you see is then applied by hand with a chip brush by dabbing it on. I sometimes also spray it on with a hopper gun if it is a large product. The look you want to achieve can be changed by how much of the product is applied, or how even the coat is. The product i use is an epoxy based paint, pretty much the same thing as the truck bed liners people have sprayed on. My local paint store mixes me a recipe i came up with several years back. Afetr it is applied and dried it is then sanded down to take all the "rougher" spots off before the first coat of paint goes on. from ther you can pretty much age it as much as you want with differnt faux finishing techniques. It takes a heck of a long time to do but is really worth the time. I always think that half the look is in the paint job on this arch. stuff.....hope this helps.