I mixed some sodium silicate today and unsuccessfully tried to make a core. For some reason the sand mixture wouldn't bind.
Any reason why it wouldn't bind? Maybe too much sodium silicate? I had the CO2 pumped for a while. There was no spot where it was hard, the thing just crumbled.
I've used this mixture before, but not for such a big core (the diameter was about 3.5in and the whole thing was about 8in. The sand has been in the outside shed and it's been freezing temps lately. I made this in my house so it was in room temp.
I ran out of the sodium silicate so I'll have to wait until I get more.