Scale - Weighting 2 part materials for accurate measurement of materials results in the best curing
Vac degasser - Removes air bubbles in for high viscosity materials. This is key to smooth surfaces, strong parts, and clear materials
Roto-Caster - a special tool for shell molding
Sculpting tools, Stainless
Hot Melt gun - fast fixup / sealing casting forms.
Items that wear out:
Sculpey - Useful for mold forms and plugging gaps
Calking - Sealing mold forms
Thick Cardboard - for making mold forms. foam board is also an option
Legos - for making odd shaped mold forms
Brown papers - Cover surfaces for easy clean up
Paper towels - Most processes are messy, and are time critcal... fast clean up.
Mixing wares - Stainless or disposable mixing containers speed up the mixing process for limited pot life materials
Measuring cups - for volume based materials accurate measurement of materials is key to best curing
Timer - To keep track of time critical pot life