making you own knobs

[jorgen.bergfors at idg.se]

Here is another model railroader.
I use silicone rubber to make molds. It is manufactured by Wacker chemicals (germany?) and the correct type is RTV622ME.
You can use ordinary slow setting Araldite for making knobs. An open mold will do, as the back of the knobs wont be visible. I have even made gears with this method.
If you want the knobs painted, it is best to paint the inside of the mold and then add the Araldite. I bake the Araldite at 80 degrees in the oven. That gives maximum strength and removes any stickiness, that can be a problem otherwise.
The only problem with this method is avoiding air bubbles. If you have access to a vacuum chamber, you are lucky. I don't, so I have to be careful to avoid bubbles.
/Jorgen