Hello, acid To my knowledge (I say this because there are always new products come) should contact cement (neoprene), gel is better. I made quite a show like this. Preparation property element, cut, sanded, etc.. You put the item glued, largely (but not beyond it) by drawing waves. You apply on the wall, applying pressure, then remove and place on land. It is half the glue on the wall. Allow to dry to the finger no longer sticks. At that time (10 min or less), set out your item in front, and apply at once, and press it, it is now. Note, not entitled to the Error: once installed, it's over (hence the name contact cement). If you miss once, go immediately to a rifleur off and start having scraped the glue to the max.
To a beautiful finish, it is important to do everything around the coating so there have not "black" between the rod and the wall.
This technique has the advantage of avoiding the nails should be driven out and filled, for a beautiful record. But in some cases, it is necessary to use nails!