how I make sand core's

[oldgoaly]

I haven't tried this yet but I was told it works fine, if you have some cores and put them in a closed container, then feed CO2 slowly in to the container, leave them over night they will get hard just fine. I'm thinking a small plastic bag may work too. I always seem to need 3 hands when holding a core, the hose for the CO2, then the valve....... I do like the smell of molasses baking in the oven! better than it does when de-rusting!