Rock Wall is shedding Dust

[thomasm2001]

I have a rock (Coral stone maybe) wall over the mantle of my fireplace. There is always a bunch of white/yellow dust on my mantle. Is there anyway to seal this rock so this doesnt happen? Thanks

 

[glennjanie]

Welcome Thomasm:
Yes, I think it would work just fine. I would brush any loose stuff off the stones, then use polyurethane in an airless sprayer (such as a Wagner). Be sure to mask and protect surrounding surfaces.
Glenn

 

[thomasm2001]

Thanks, ill give it a try