Installing method for polysulfide sealing cap

The invention discloses an installing method for a polysulfide sealing cap. The installing method comprises the steps that firstly, a sealing cap opening is arranged upwards, a glue nozzle glue outlet of a glue gun ejects the top end of the sealing cap, a glue nozzle moves outwards along the inner wall of the sealing cap along with increasing of the glue injection amount, and when the volume of an injected sealing agent is about 2/3 that of an inner cavity, injection is stopped; the sealing cap is vertically and slightly buckled on a fastener, then, the sealing cap is slightly buckled to the position close to the bottom and slowly rotated to the bottom, and rotation by about 2 circles is conducted; checking is conducted, and if overflowing sealing glue is even and continuous, it is shown that the sealing effect is good; and if overflowing sealing glue is not even or continuous, the sealing effect is not good, the sealing agent is removed thoroughly, the surface is cleaned, and sealing is conducted again. The