Bumping
There is nothing wrong with bumping a thread that is yours. BUT, if you're bumping it every hour, it can really congest things, and really tends to look like spam. Try and keep it to one thread and bump it maybe once a day at maximum. People will see your thread, I promise! If you find you don't get any kind of response in twenty-four hours, it's perfectly fine to bump your thread, but try not to make multiples for the same sale or request.