Looking for help on casting small parts

[twilight]

I've been trying to replicate some hopper door latches and they're not turning out so well.

Here is what I'm trying to replicate.



Here's how they've come out. I've painted them so I could see the detail or other imperfections.


If you look closely, you'll see air bubbles. Either molded on or small cavities. Some maybe usable but many are not.

I've been using this to make the mold.


And using this to make the casting.


Any thoughts or suggestions would be appreciated.

Thx,

Mark