I noticed that you can only edit your on comments within 5 minutes after posting them. By accident I left an half-baked comment but when editing it, it exceeded the 5 minute limit. Instead I deleted my comment and added the corrected version instead.
I guess proofreading the comment before posting it, is a good idea to avoid the situation. But when it happens, is it acceptable to delete it and repost it when there was no activity yet? Or is it recommended to leave old comment and post the new one as "Upps, what I really meant was..."?