Epoxy is a term used to denote both the basic components and the cured end products of epoxy resins, as well as a colloquial name for the epoxide functional group.
Most green cards are valid for 10 years before you need to renew them. However, if yours was issued on the basis of your marriage to a U.S. citizen or a legal permanent resident, and the marriage is less than two years old, your card is only valid for two years.
It is possible to obtain a green card based on marriage to a U.S. citizen even if you have overstayed your visa. Your U.S. citizen spouse can file a Form I-130, Petition for an Alien Relative, on your behalf, together with your own green card application on Form I-485, Petition to Adjust Status. The forms and instructions are available for free download on the Forms page of the USCIS website.