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I see that the EasyFlo 60 has a mixed viscosity of 60 cps and the Smooth-Cast 320 has a mixed viscosity of 80 cps, which is significantly higher and around 5 wt. motor oil.
Silpak...... There is nothing better.
After hundreds of castings, I have yet to have the mold fail to fill properly.
Is that hundreds of castings from a single mold, David?
I've found the Micro-Mark 1:1 Rapid mold material to have very limited use. It's OK for quick test molds, but its lack of strength makes it pretty much useless for production molds. My mold material of choice is Smooth-On Mold Max (10, 20, 30 and 40, depending on the application); depending on the complexity of the mold, they last for 50-100 castings or more.For resin, I use Smooth-Cast 305 and 310 the most, but I have about a dozen other types on hand depending on the application. I never use mold release, thinners, or any additives (other than Smooth-On So-Strong dyes) as I've found that they compromise the casting quality.
I used to be concerned about the viscosity of Smooth-Cast, but once I started high-pressure casting, all of those concerns have gone away. The exhaust stack is .015" wire, and the control levers are .010" wire. After hundreds of castings, I have yet to have the mold fail to fill properly.
Which resin do you use?