One inch Stucco Foam And Acrylic Letters This exterior sign is made from 1'' thick foam & acrylic faces. The foam is stucco coated to protect it from the birds, bugs & weather. The acrylic faces were back painted to match the customers PMS colors. We installed the letters with double sided foam tape and silicon on a boom for safety. You can drive by and see this job at 14 Morgan in Irvine, Ca. No job is too big or too small for us to do. Call us with questions or for a FREE estimate. 949-770-9252. We are here to help you.