When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Nope, the stop leak products won't help the seal. The only one that may is Auto Rx or Lubro Moly motor oil saver both are ester based and can renew rubber compounds.
Also you may want to take the plug out of the bottom of the bellhousing and inspect to make sure it is the rear seal and not the oil pan. I have been a mechanic for a long time and 95% of the time when somebody thinks their rear seal is out it is just the oil pan gasket. Most of the time a bad rear main will get oil all over the back side of the flywheel/flexplate. I would make sure if i was you before you start tearing into it.