How To Finish a River Table! We get a lot of questions about how we finish our tables so below I’ve included some info on how we use Rubio Monocoat USA on our tables: 1. After the EcoPoxy FlowCast is cured we take the table out of the form (we use HDPE for our forms) 2. Next step is to flatten the work piece. We use a cnc to flatten our table tops but you can also make your own router sled or if your piece is smaller, you can send it through a planer. 3. Sand the work piece at 80, 100, 120, 150,