Here are some photos from a restored section of  the faux bois arbors in The Huntington's Rose Garden. (October 14th, 2012).  

This fellow landed right next to me. I love this place!

My color blending of old and new faux bois looks good even when the material is wet. I achieve this by mixing a grout color that matches the old material after I've wet it.

My next location is in the distance just beyond the entrance to the Japanese Garden

I use a disposable pastry bag to push material into voids and sometimes for texture effects.

The "twisted" rebar used at the Huntington was invented in 1884 by Earnest L. Ransome in San Francisco, CA. He discovered that it "locks" better with the concrete and was used in North America until the 1920's. The remaining "sound material" survives because the material actively "breaths" and operates like the old car in a desert. As the material dries out it is drawing the moisture out of the steel and preventing its corrosion. Rusty but not rusting. It fails only in the places that are trapping the water and rusting the steel like the old car in a lake. It expands as it rusts and creates the failures, but also the way to find the decay and correct it.