Looking good. I like how epoxy can take multiple pours hours apart and still have a chemical bond between them and no glue line.
Hopefully there's a sacrificial sheet of something on the floor? I've got a few different rectangle shapes marked out on the concrete floor of the sheltered workshop. Marked out in either drops of resin or stains from the resin I scrapped/chipped off the floor
Took me a few years to realise I should put something down on the floor first. First attempt at doing so I used cardboard and that was a nightmare to chip off the concrete floor once the resin had worked its way through the cardboard and fused everything to the floor when it cured. Now I just use old scraps of wood destined for the incinerator.
Are you sealing the edges before the main pour to help reduce bubbles? Or not really needed. I see the gas torch there on the bench, presumably for popping them? I use a portable butane torche that just screws to the top of those wee butane/propane camping gas cans. Tried a heat gun, didn't like it. Tried the gas torch but I didn't like messing with the lines and keeping them from dropping dust into larger pieces I have to lean over to reach.