Acrylic is a sturdy, waterproof material, which can be installed outside. Cut out lettering should present no problems, and under awning acrylic lightboxes would be fine as well. We do not recommend the use of acrylic panels for panels which are fully exposed to the sun. For outdoor panels, long term application, we recommend ACM – Aluminium composite panels. For cut out lettering acrylic there is no problem with possible expansion of the material as the panels would have so that is doable to applied exposed to the sun. Each signage project is unique, and whether or not acrylic / Perspex is applicable, depends. Contact our design team and we can advise you.