Hanaldo, please, tell something about your experience and skilful of epoxy tooling board making to top mirror finish. I just testing that proposal, I have a several brands of sealers (Marbocote, Acmos, Axel, Frekote), but all of them, that's a little bit nightmare work to finish the surface in top mirror look. I'm still unsuccesful. I have tested a several processing methods just like brush, roller, spray gun, sand it 400/600/800/1000/1500/2000, linth free cloth, apply another several coats, but still not top class....marks, dust. I tested polishing that too, but that's not effective way to do.
I just working on an high accuracy autoclave mould, that's the reason why the sprayable topcoats are not possible to use...I have tested that way as well...