Container closure with ribs formed in sealing compound

A closure for a container and comprising:

• an end panel;
• a generally outwardly convex sidewall depending from the end panel and terminating in an inwardly directed curl;
• wherein the curl lies on the inside of the sidewall such that the sidewall and the curl provide a substantially smooth outwardly facing surface;
• and
• a sealing compound extending down the inner surface of the sidewall,
• wherein a plurality of ribs are formed in the sealing compound, spaced apart around the circumference of the sidewall, each rib extending down the sidewall and projecting radially inwardly.