A cap system for enclosing a metallic fastener assembly extending through a structure, comprising: a washer configured to be associated to a metallic fastener assembly; a first securement mechanism positioned about a periphery of the washer wherein the first securement mechanism comprises threads; and a cap member comprising: a sidewall having an inner surface which defines a cavity dimensioned to receive the washer and defines a second securement mechanism complementary configured to engage the first securement mechanism positioned about the periphery of the washer; and an end of the sidewall of the cap member defines an opening which provides the washer to have access into the cavity, wherein the end of the sidewall of the cap member defines a groove which extends about the cap member; the cap system further comprises: a first opening defined by and extends through a first portion of the sidewall of the cap member wherein the first opening communicates with the groove such that a first flow path extends through the first portion of the sidewall of the cap member and into the groove for conveyance of sealant; a second opening defined by and extends through a second portion of the sidewall of the cap member wherein the second opening communicates with the groove and the second opening communicates with the cavity of the cap member such that a second flow path extends from the groove, through the second opening of the sidewall of the cap member and into the cavity; and a third opening defined by and extends through the sidewall of the cap member wherein the third opening provides a third flow path from the cavity of the cap member through the third opening of the sidewall of the cap member. a washer configured to be associated to a metallic fastener assembly; a first securement mechanism positioned about a periphery of the washer wherein the first securement mechanism comprises threads; and a cap member comprising: a sidewall having an inner surface which defines a cavity dimensioned to receive the washer and defines a second securement mechanism complementary configured to engage the first securement mechanism positioned about the periphery of the washer; and an end of the sidewall of the cap member defines an opening which provides the washer to have access into the cavity, a sidewall having an inner surface which defines a cavity dimensioned to receive the washer and defines a second securement mechanism complementary configured to engage the first securement mechanism positioned about the periphery of the washer; and an end of the sidewall of the cap member defines an opening which provides the washer to have access into the cavity, a first opening defined by and extends through a first portion of the sidewall of the cap member wherein the first opening communicates with the groove such that a first flow path extends through the first portion of the sidewall of the cap member and into the groove for conveyance of sealant; a second opening defined by and extends through a second portion of the sidewall of the cap member wherein the second opening communicates with the groove and the second opening communicates with the cavity of the cap member such that a second flow path extends from the groove, through the second opening of the sidewall of the cap member and into the cavity; and a third opening defined by and extends through the sidewall of the cap member wherein the third opening provides a third flow path from the cavity of the cap member through the third opening of the sidewall of the cap member.