I’m sure this has been covered and I searched but what I found of others asking had no answers. Then I google searched and just got how to kill mold in your house lol. I have a part that was primed with Spies Hecker 5310 HS primer. If I block this out and work my way to finer grits, can I use this as the plug surface to make a mold? Or should I paint and clear, polish and buff it to get a good surface. I’m worried the primer will be too porous.