early this week I started hearing a creaking noise coming from the bb area, and since I don't have the proper tools to check it myself I took it to my lbs.

To make a long story short, they tightened the noticeably loose bottom bracket on both sides. Afterwards they mechanic suggested that if the creaking returned to bring it back so they can throw some loctite on the threads. And of course after about 20 miles, the creaking came back...not so loud this time, but its definitely there

My question..... is that a good idea?