The glue creates a hard spot that will leak. Stationary designs are the best. In this design the spring or springs do not rotate with the shaft. Many of these seals are used on mixers and this is a necessary feature in a mixer application. Once the proper mechanical seal has been specified for the application, the really difficult part takes over.
Someone has to do the application for the individual chemicals and troubleshooting of failed seals.
Because these people are rare, we see consumers throwing seals at the application hoping one of them will work. It would be wonderful if you could call in three or four seal companies selling the same product, with the same level of expertise and choose among them for your best price. The fact is you will be lucky if you can find one good supplier, and I will bet he will not be the lowest price. He will likely have the highest inital cost. The Mc Nally Institute 1986 S. Belcher Rd.