EX-P is a synthetic sealant and it will outlast a wax by months. It won't look as 'wet' as a wax finish will though.

If you have a real super el-cheapo polisher that looks like one of these



then don't even bother trying it on your paint. They are useless.

If you can afford to get even a cheap random orbital sander like one of these


as well as a light cutting pad and a polishing pad you will be in business. Actually one of those polishers and the two pads will give you the chance to recoup your money by doing one or two paying details.