Cover assembly for spray can and spray can

A cover assembly for a spray can, characterized by comprising:

• an outer cover;
• a piston cover, capable of being mounted into the outer cover in a push-pull mode;
• an insert tube, fixedly arranged on a top of the outer cover and communicating with an inner cavity of the outer cover;
• and
• a gland;
• wherein the gland is capable of being buckled on the top end of the outer cover and blocking the insert tube, and also being capable of being buckled on the bottom end of the piston cover and blocking a bottom end of the piston cover;
• when a bottom end of the outer cover is buckled on a top of a can assembly of the spray can, the piston cover is capable of fully entering the outer cover and shielding a spray cap of the spray can;
• and
• when a top end of the outer cover is buckled on the top of the can assembly of the spray can, the insert tube is capable of being inserted into the can assembly so that the piston cover may sequentially push contents, previously loaded into a place between the piston cover and the outer cover into the insert tube and the can assembly of the spray can, after being pushed.