Dave:
If this are paper signs (i.e. printed on normal paper) below is the procedure I use:
1. Using 150 grit paper sand the back side until you can see the image coming through the paper. This take practice so make copies of the signs and play with them first. Some people even sand so holes appear to make the sign appear worn.
2. Spread white wood glue on the back and place the sign where you want it to go. Placement must be exact - no redoes. Then gently press the sign into the surface.
You find the sign has the feel of a painted on look.
By way of comparison the Coca cola sign was left as is, glued to a piece of styrene then to the wall. the other signs were applied using the above sanding technique.
You can get an idea how the sign blends into the clap board siding above
These are signs on board and batten.
Joe
