Dang, that is ORANGE.

I usually have the best luck avoiding “number bubbles” by using paint formulated for airbrush. It’s much thinner so coats beautifully.

My youngest works at a Lego store. This is now hanging in their break room.

Truly brilliant.

I have had mis-fits on molds before, but cap molds will more often have raised face issues (cap did not seat all the way on).

There is a style of mold, often referred to as “sprue mold” that are single piece molds where you pour into the corner.

That was a test die that I colored with markers.

Cap molds are a literal two-part process. The “bottom” is cast upside-down, as you adhere the dice to the base and pour the molding material over them.

For the “top” mold, remove the bottom piece from its mold form; flip it over; either cut out or remove your keys (voids that will fill in as part of the top mold, allowing for perfect alignment); coat with a mold release (I used petroleum jelly for this one, but will often use corn starch); put into your mold form; and pour your molding medium.

I use a sous vide system to get the specific temperature.