HeavyG said:

GrateEggspectations said:

Very, very cool. Just curious, what happens when the ceramics crack? Do they replace the lid of base the way they do an Egg?

They're not made from ceramic. Most of the mass is refractory cement. Never have heard of anyone having anything crack but I'm sure if one did they would replace whatever broke.

What You Will Need:

• Portland cement (You can purchase a 94 lb. bag at your local hardware store for less than $10.)
• Perlite (Can be purchased for $10 to $25.)
• Silica Sand (A 50 lb.bag costs less than $25.)
• Fire clay or Well drillers mud (A 50 lb. bag averages less than $10.)

The Formula

1.5 parts Portland cement + 2 parts Perlite + 2 parts silica sand + 2 parts fire clay

What to Do:

Using the portions listed measurements listed above, mix the Portland cement, Perlite, and silica sand together thoroughly.

Combine the mixture with 2 parts fire clay.

Once the mix has the consistency of stiff cookie dough, pack it into the performed form. You may need to add a little bit of water to get the right consistency.

Allow it to dry for several days.

Pretty easy. Refractory cement is cheap to make.