The previous couple days I have been checking the catch pail under drain pipe. Have been filling basin full  and draining it out a couple times a day. The catch pail has been dry when checking it. Looks like the leak has stopped.

Quite possibly filling basin with hot and cold water created expansion and contraction on all the seals which caused them to move into position sealing the leak. Will leave pail in there for about a month more.

All other final punch out I mentioned in previous post completed. 

Bath remodel done

I am happier as a fox in the chicken coop.

I will order the spray sealant for the vanity bottom later on.