John,
Nice job on the spin casting, keep them coming!
Cameron,
That's basically where I started- I didn't know any better. My very first mix (picture 1) had only three components, and they were mixed visually, not formulaically (post#853). I'm sure the density was better back then. I should just throw away the scale and go back to my roots
You also mentioned air voids.. I'd say they're the same- segregated or not. Here are the samples from posts #1635 (premixed) and #1639 (segregated). The latter has some carbon black in it- a bit harder to see details, but the air voids are identical.
These samples feel great and sound great, pretty close to AkvaCNC's commercial sample (except for the bubbles of course). I'm very happy with them- now wait till I get the coupling agent working! And some de airing..
Good times.