Thought I would mention :

If you are building a strip matrix and purchasing non- waterproof product

be aware that some vendors apply the 3m peel and stick which is quite annoying for certain builds .

Also this is a personal thing but I could not stand the reflective _ness of the shiny silver solder on the strip .
During the day or off time they glisten and during display time they provide unwanted reflective_ness
Fortunately I am in the final stages of rebuilding and used a black sharpie to eliminate them .