Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

My Petrobond (this is a tradename for an oil-based foundry sand) was beginning to dry out, and so I made the mistake of adding oil to it.
This ruined my sand, and ruined the casting also.

Lesson #5:  Don't add oil to your petrobond.  Add alcohol.

So I was just stumbling along, learning as I went.

I was getting close to creating usable parts, but still experiencing lots of blunders, and it seemed like I may be up against an infinite learning curve.