A system for applying a shaped sealant shroud to a portion of a fastener, the system comprising: a fitted cap, comprising a wall, a cap cavity defined by the wall and configured to receive sealant therein, and a relief opening that fully penetrates the wall, wherein the fitted cap is positionable over the portion of the fastener such that: the portion of the fastener is received within the cap cavity; a uniform gap is formed between the wall of the fitted cap and the portion of the fastener; and the relief opening is communicatively coupled with the uniform gap; and a cap-manipulation tool, comprising a shaft, wherein: the shaft has a longitudinal central axis and comprises a through, circumferentially closed, channel; the cap-manipulation tool is configured to couple to the fitted cap such that: the through, circumferentially closed, channel of the shaft is communicatively coupled with the relief opening of the fitted cap, and the fitted cap is rotatable together with the shaft about the longitudinal central axis of the shaft to distribute the sealant, previously introduced into the cap cavity, in the uniform gap to form the shaped sealant shroud around the portion of the fastener, and the relief opening is oriented to purge at least one of gas or excess of the sealant from the uniform gap into the through, circumferentially closed, channel of the shaft. a fitted cap, comprising a wall, a cap cavity defined by the wall and configured to receive sealant therein, and a relief opening that fully penetrates the wall, wherein the fitted cap is positionable over the portion of the fastener such that: the portion of the fastener is received within the cap cavity; a uniform gap is formed between the wall of the fitted cap and the portion of the fastener; and the relief opening is communicatively coupled with the uniform gap; and the portion of the fastener is received within the cap cavity; a uniform gap is formed between the wall of the fitted cap and the portion of the fastener; and the relief opening is communicatively coupled with the uniform gap; and a cap-manipulation tool, comprising a shaft, wherein: the shaft has a longitudinal central axis and comprises a through, circumferentially closed, channel; the cap-manipulation tool is configured to couple to the fitted cap such that: the through, circumferentially closed, channel of the shaft is communicatively coupled with the relief opening of the fitted cap, and the fitted cap is rotatable together with the shaft about the longitudinal central axis of the shaft to distribute the sealant, previously introduced into the cap cavity, in the uniform gap to form the shaped sealant shroud around the portion of the fastener, and the relief opening is oriented to purge at least one of gas or excess of the sealant from the uniform gap into the through, circumferentially closed, channel of the shaft. the shaft has a longitudinal central axis and comprises a through, circumferentially closed, channel; the cap-manipulation tool is configured to couple to the fitted cap such that: the through, circumferentially closed, channel of the shaft is communicatively coupled with the relief opening of the fitted cap, and the fitted cap is rotatable together with the shaft about the longitudinal central axis of the shaft to distribute the sealant, previously introduced into the cap cavity, in the uniform gap to form the shaped sealant shroud around the portion of the fastener, and the through, circumferentially closed, channel of the shaft is communicatively coupled with the relief opening of the fitted cap, and the fitted cap is rotatable together with the shaft about the longitudinal central axis of the shaft to distribute the sealant, previously introduced into the cap cavity, in the uniform gap to form the shaped sealant shroud around the portion of the fastener, and the relief opening is oriented to purge at least one of gas or excess of the sealant from the uniform gap into the through, circumferentially closed, channel of the shaft.