source: The polymer is most often epoxy, but other polymers, such as polyester, vinyl ester or nylon, are also sometimes used.
target: The most commonly used polymer is epoxy.  However, other polymers used include polyester, vinyl ester and nylon.
references: The most commonly used polymer is epoxy.  However, other polymers used include polyester, vinyl ester and nylon. The polymer is most often epoxy, but other polymers, like polyester, vinyl ester or nylon, are also sometimes used. The polymer is most often epoxy, but polyester, vinyl ester, or nylon are sometimes used. The binding agent is most often epoxy, but others, such as as polyester, vinyl ester or nylon, are also used. The polymer is most often epoxy. Polymers such as polyester, vinyl ester or nylon are sometimes used. The chemical is usually epoxy, but other chemicals like polyester, vinyl ester or nylon, are also sometimes used. The polymer is most often adhesives but other polymers like polyester, vinyl ester or nylon, are also sometimes used. The material used is usually epoxy, but polyester, vinyl ester or nylon are also used sometimes. Epoxy is the most common polymer used.  Sometimes vinyl ester or nylon are used. The most popular polymer to use is epoxy.