I have just finished a CoreCork Compsand board using muslin (internal) and glass (external). The build is fine (albeit a bit heavier than originally planned), but I find it difficult to get a decent finish with the resin I use. I have built half a dozen boards with it, but a nice finish still eludes me.
Here is a Cork/Linen/Muslin Composite. The problem I have is that the gloss coat is shiny, but with loads of imperfections on it. I have been told the remedy is to heat the Bioresin before brushing and using a hot air gun to help the resin flow afterwards.