A system for applying a shaped sealant shroud to a portion of a fastener, the system comprising: a fitted cap, comprising a wall and positionable over the portion of the fastener such that a uniform gap is formed between the wall and the portion of the fastener, wherein the fitted cap further comprises: an inlet opening, fully penetrating the wall, such that the inlet opening is configured to be communicatively coupled with the uniform gap; and a vent, fully penetrating the wall, such that the vent is configured to be communicatively coupled with the uniform gap, wherein the inlet opening and the vent are spaced apart from each other along the wall; and a cap-manipulation tool, comprising a shaft, wherein: the shaft has a longitudinal central axis and comprises a through, circumferentially closed, channel, configured to receive sealant and to communicate the sealant therethrough; the cap-manipulation tool is configured to couple to the fitted cap such that: the through, circumferentially closed, channel of the shaft is capable of communicating the sealant through the inlet opening of the fitted cap into the uniform gap; the vent is oriented to purge gas from the uniform gap as the sealant is communicated through the through, circumferentially closed, channel into the uniform gap; and the fitted cap is rotatable together with the shaft about the longitudinal central axis of the shaft to distribute the sealant in the uniform gap to form the shaped sealant shroud around the portion of the fastener. a fitted cap, comprising a wall and positionable over the portion of the fastener such that a uniform gap is formed between the wall and the portion of the fastener, wherein the fitted cap further comprises: an inlet opening, fully penetrating the wall, such that the inlet opening is configured to be communicatively coupled with the uniform gap; and a vent, fully penetrating the wall, such that the vent is configured to be communicatively coupled with the uniform gap, wherein the inlet opening and the vent are spaced apart from each other along the wall; and an inlet opening, fully penetrating the wall, such that the inlet opening is configured to be communicatively coupled with the uniform gap; and a vent, fully penetrating the wall, such that the vent is configured to be communicatively coupled with the uniform gap, wherein the inlet opening and the vent are spaced apart from each other along the wall; and a cap-manipulation tool, comprising a shaft, wherein: the shaft has a longitudinal central axis and comprises a through, circumferentially closed, channel, configured to receive sealant and to communicate the sealant therethrough; the cap-manipulation tool is configured to couple to the fitted cap such that: the through, circumferentially closed, channel of the shaft is capable of communicating the sealant through the inlet opening of the fitted cap into the uniform gap; the vent is oriented to purge gas from the uniform gap as the sealant is communicated through the through, circumferentially closed, channel into the uniform gap; and the fitted cap is rotatable together with the shaft about the longitudinal central axis of the shaft to distribute the sealant in the uniform gap to form the shaped sealant shroud around the portion of the fastener. the shaft has a longitudinal central axis and comprises a through, circumferentially closed, channel, configured to receive sealant and to communicate the sealant therethrough; the cap-manipulation tool is configured to couple to the fitted cap such that: the through, circumferentially closed, channel of the shaft is capable of communicating the sealant through the inlet opening of the fitted cap into the uniform gap; the vent is oriented to purge gas from the uniform gap as the sealant is communicated through the through, circumferentially closed, channel into the uniform gap; and the fitted cap is rotatable together with the shaft about the longitudinal central axis of the shaft to distribute the sealant in the uniform gap to form the shaped sealant shroud around the portion of the fastener. the through, circumferentially closed, channel of the shaft is capable of communicating the sealant through the inlet opening of the fitted cap into the uniform gap; the vent is oriented to purge gas from the uniform gap as the sealant is communicated through the through, circumferentially closed, channel into the uniform gap; and the fitted cap is rotatable together with the shaft about the longitudinal central axis of the shaft to distribute the sealant in the uniform gap to form the shaped sealant shroud around the portion of the fastener.