I keep thinking about the sander fence I want to make and the shape might be too tricky for a 2 part sand mold but my mind keeps going to lost foam. Searched here but couldn't find much. Has anyone done lost foam iron casting? Kentucky Packrat mentioned it briefly but no details. I found plenty of use in industry and there's much emphasis on the coatings being just right especially in terms of permeability. Around the 3:00 mark here.
Found a company that makes lost foam iron coatings and will see if they sell small amounts. Will call IFSCO too but didn't see anything in their catalog.
And a great breakdown of how lost foam coatings work and hints to possible home brews.
Looks like the ingredients could be rounded up but the critical percentages are a mystery. So just wondered if anyone has been down this road. Much of the info available indicates lost foam is better than sand for casting iron in many respects and could be great for a small one off job like my sander fence.