When air and other gases collect under vinyl film and expand due to heat, they can generate enough force to eventually lift the vinyl off the sign surface, forming small bubbles.
In some cases the gases are escaping from paint finishes which are not completely cured, and other times the base material itself can “outgas.” This occurs most frequently in acrylic and polycarbonate sheeting. Finally, the installer can create bubbles or “lift” them into a graphic during the installation itself.
Since bubbles are almost always the symptom of variables controlled by the installer, the good news is that they can easily be reduced by making some small technique changes.
If you are faced with bubbles in a finished sign:
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