Too much Mms (moving mass) on the cone could cause issues, how much mass is a problem, depends on the sub //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
A paper dust cap my need to be sealed first to ensure a good finish, and a plastic one will need a plastic primer, but the added weight from the paint is a non-issue with subs.