small part resin castings

[twilight]

Has anyone had any success with casting small detail parts in resin? To give an example of how small, think of sander valves, or marker lights. I would like to give injectors a try, but they look like they are going to be a challenge, especially with the tubing. The rubber mold I have made for the smaller parts leaves out some details. I am assuming it's from air being trapped in the mold. I would really like to learn how to do this because these detail pieces are getting more scarce buy the day. Just want see what other modelers have come up with.

Mark