Labels

Redoing my panel and looking for label material suggestions. Have used 3M Scotchcal vinyl film and Gerber Quantum marking films in past. Since they are designed for external vinyl signs, the printing holds up very well to UV. The problem is the adhesive. Since some of the labels are only 1/8" x 1/4", the surface area for adhesion is very small. In addition, the texture of the panel surface also reduces the surface area for adhesion. After a couple of years they start to come off. The films are designed for very large exterior signs where there is a large surface area for adhesion. Any suggestions? The only thing I could think of was to use a small dab of epoxy on the back of each label.