sand versus shot in speaker stands

Would there be an issue in using lead if once installed it were potted in place using expanding foam or other 'goo'?
How about using some kind of epoxy resin to fill the stand/voids after filling w/shot? No way will it ever come out or get to atmosphere.

Wear gloves / long sleeves / and a particle/dust mask when handling it?

Blasting sand is dry in the bag and ready to use. No stirring or baking is required.

Elizabeth is correct. Sand is neither hydrophilic nor deliquescent. Sand does NOT absorb moisture from the atmosphere. Sand attracting moisture is another myth perpetuated by repetition by those who flunked chemistry.

One thing I neglected to mention, we don't physically handle the lead shot. It is taken from the bag it comes in and deposited in an awaiting supply tray, then fed into the MEC presses.
The way it is stored in it's original 25 pound sack has never caused us problems.

That being said, I sure wouldn't ingest it, nor would I handle it for any length of time without hand protection, and I sure wouldn't let the kids play with it.

The cost of lead shot has sky rocketed over the last 50 years, but the alternative in steel shot is even more expensive in 25 pound bags.

I agree with Jaybo in much of what he says. I'm not a big fan of sand for moisture purposes, but if you need shot for this purpose alone of weighting down your stands, use steel shot.

When I was a kid back in the dark ages, we all played freely with lead in all forms. I can remember having a kit of molds into which we poured melted lead to make toy soldiers, then painted them, probably with lead-based paint. Did we wash our hands after doing this? No. Would I recommend doing it today? No. Do I think there's any real danger using lead shot to fill speaker stands? No again.