For this project we will be making the castable refractory mix from scratch, however if you have access to a commercial high temp castable refractory by all means.
The mix is composed of 2 parts all purpose sand, 1 part fireclay, and 1 liter of water. You will first thoroughly mix together the sand and fireclay, and then, with a spray bottle or plant watering can, apply the 1 liter of water gradually mixing in between. You don't want any puddles to form as it will separate the sand and fireclay granules which could weaken the mix.
The mix is ready when you can squeeze it in your hand and have it take the shape of it, if it then will break clean in half, and finally if you can squeeze it into a ball, toss it up and catch it without breaking.
Once the mix is done and passes all the tests, cover it with a tarp and let it sit for 12-24 hours. You can work on the furnace lid & body while you wait.
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