Should not be a problem. The silicon rubber has a shrink factor to it. Usually .001 to .003 . Worse if it's cheap rubber like Alluminlit. Check their website for spec. on there resin. With painted parts and plated. In my experience will not effect the casting. I usualy prime all my parts before I mold them.
That's true. But Model Chrome is not telling you that on their Facebook .I was just bring up that you have to provide them with a perfect part. They will not do the work for you. I know if you send me a bad part. I will send it back unfinished.
This is really not a new process. It’s the same process they use to silver plate mirrors. Centuries old. I just bought a kit. And will soon start doing platting. This is a chemical process not real chrome platting. Thickness depends on how much you apply. About the same thickness as vacuum platting. But what they don’t tell you is that your parts have to be perfectly smooth. Any flaws in the surface will show up. They like me will not finish the parts for you. So I would recommend that you paint a black or very dark blue base coat on your parts. This way you will see the surface shine that you will get back. If it is shinny and no marks. The silver will coat it and shine like chrome. The clear coat is sprayed on it to protect it. An automotive clear urethane is UV protected. It will not turn yellow in time. I don’t know about Model Chrome. But they will tell you that they are not responsible for under surface finish. What you see is what you get.
I never have problems with bubbles. I always pressure cast. I mostly do two part molds. Some cheaper resins have a tendency to naturally produce bubbles. Careful, Some resins will foam up when you vacuum. I use Smooth-On products for all my casting needs.
I use automotive quality greass and wax remover. 3M is a good brand. But Turtle Wax sells a bug and tar remover at the parts store. Same thing. Removes all wax and sillicon. Just wipe it downd with a well soaked rag. Do this before any sanding is done to you parts. Use it again before you paint. Removes oily finger prints.