Investment is like a bag of cement.
Even though the ingredients all look the same they have different
With time, a bag of cement will separate just sitting.
So will investment.
Investment should be mixed with a good dust mask and your hand.
Just reach into the bag and bring the bottom investment to the top.
I do this once or twice a month.
You can feel the material mix. You can also feel the consistency of
In the old days (1970s) we used to flip the barrels upside done
every other month.
We usually bought ten barrels at a time and they would last us about
Old unmixed investment will not breath like new investment which
will cause a lot of problems.
Blow outs and porosity to name a few.
Spin and vacuum casting since 1971.