Folks here are going to be horrified, but Tim and I don’t measure
and we use tap water.
We mix with our fingers. Yup. Our formula is to mix investment and
cold tap water the thickness of Belgian waffle batter. Not waffle
batter, but Belgian waffle batter. Just a tiny hair thinner than
We vacuum twice. Once in the bowl and once in the flask.
We buy big barrels of investment. It takes us a while to go through
I like to roll a closed barrel periodically to keep the different
particles well mixed.
We always get great results.
The last time we lost a casting was years ago when our kiln went
crazy and melted the flasks.
I know. So low tech. But it has worked for us for decades.
Have fun and make lots of jewelry.