Well i quess im building an oven!

[Johnny the oven man]

Yeh that looks like a normal airsetting refractory mortar. If you need, "fatten' it up with sand but shouldnt need it. Sand would give it a bit more guts.

[FIREANDFLAMES]

Thanks all for the replys. here are some updated pics.

[asudavew]

So far so good!

You are at the hardest part. (in my opinion)

Take your time.

[DrakeRemoray]

Oh Man, I hate to jump in late here, but doesn't air set mortar mean that it continues to be able to be dissovled by water and therefore unsuitable for outdoor use?? I saw that it was a dry mix so did not think anything of it...usually the air-set mortars come premixed...

[asudavew]

Originally Posted by DrakeRemoray

Oh Man, I hate to jump in late here, but doesn't air set mortar mean that it continues to be able to be dissovled by water and therefore unsuitable for outdoor use?? I saw that it was a dry mix so did not think anything of it...usually the air-set mortars come premixed...

Yikes.

Doe's air-set mean it needs heat to harden?
Like a kiln temp heat?

[FIREANDFLAMES]

[asudavew]

Don't panic yet.

Wait for some answers.

[FIREANDFLAMES]

Ok!.......biting my nails.....bleeding.....eww tasting bone!!!!

[asudavew]

I'm checking google.
It looks to me like an air set mortar is what you want to use.

Not sure yet....

[egalecki]

After proper mixing and air drying, heat stop 50 is non water soluble.

Quote from the back of the bag. It does say it isn't waterproof, but non-water soluble means it won't run away like a sand castle when the tide comes in if it gets wet after drying.

Breathe. Since what I'm using says specifically "air drying", I am assuming that what you're using is the same.