I remember an article in sea angler many many years ago where someone tried two identical set-ups -one with normal lead and one with hidden lead and they claimed a much better success rate with the hidden one.
We wouldnt want to fish with over heavy line so why not try to make the lead as least obvious as possible?
I dont know how long the glue and sand would last but 2 or 3 weights would probably last a session.
Hey - it cant hurt