Which of the following options correctly lists the two types of dope used for fabric finishes?

• A. Acrylic and Vinyl
• B. Cellulose Nitrate and Cellulose Acetate Butyrate
• C. Epoxy and Polyurethane
• D. Nylon and Polyester

Answer: (B)

Fabric dope is a coating applied to aircraft fabric coverings to tighten, seal, and protect the surface. The two chemistries typically used for this purpose are nitrocellulose (cellulose nitrate) dope and cellulose acetate butyrate dope. Nitrocellulose dope dries quickly and forms a hard, tight film that causes the fabric to shrink as it cures, contributing to a strong, smooth exterior. Cellulose acetate butyrate dope, on the other hand, is more flexible and durable, offering good abrasion resistance and stability in varying conditions. The other options describe dopes or materials not used for fabric finishes in this context, such as acrylic or vinyl dopes, epoxy or polyurethane dopes, or fabrics like nylon and polyester.