You will probably find many suggestions on the best investment. I
am sure each caster will swear that the investment he/she used is
There are many injection waxes. Each is formulated for a specific
duty. Some are very flexible. Some are carveable and some work best
for large flat objects. Information about the different properties
can be obtained in catalogs.
I recommend you call Rio Grande, Swest, Gesswein, Thunderbird
Supply, Indian Jewelry Supply and the many others that have been
listed on the forum and ask for catalogs.
If possible take a casting class where you can learn the basics of
casting. It would be a great help.