Here its called glassy water or water glass. Its used as a binder in refractory cements.
Well its sold as as water solution here. The one l used was a wery concentrated one, if you leave a drop on open air it soon dryes or solidifies to a gelatinous mass and if you heat it strongly it popps up like a popcorn, interasting stuff.
Not sure if its the New years schnaps as JO wuld say, but l cant remember posting a video on sodium silicate before…
Yes l soaked the surface of the rockwool. I guess if l wuld soak tge entire plate things wuld be eaven better???