Prepare Floor Joints with Epoxy Filler

So I'm working on these saw cuts that I'm using a epoxy cabasil right here, 20-minute working time. Just skimming it tight over these joints to help make these things disappear a little bit better. So they were filled with a rigid filler before, but they weren't filled enough and so we're trying to fill them in. So what they were before we do are base cuts so they'll disappear.