Petrobond or?

[dkwflight]

I know this is not a model to be shown but
I think I have read about mixing casting sand with motor oil ( may be used).
I don't know how well this works but worth a try.

I do know of a chemical that uses CO2 to harden it, single use.
Dennis

 

[SmithDoor]

I have use Petrobond I use a 30 w oil gear oil
In mix I use 1% alcohol and petrobond clay
If looking for good foundry sand look back yard some times that good sand

Dave