Years ago on 'Tomorrows World' they showed a process that would stop wood ever shrinking, expanding or warping. The rough sawn timber was put in a large vacuum vessel & all the moisture content was sucked out then replaced by a polyurethane mist. As wood is hydroscopic it absorbed the polyurethane to replace the moisture that was removed. Once dry the wood could be machined with total accuracy without ever moving. Did this process ever get used commercially or was the polyurethane considered a hazard? It's always nice to know what happened to some of the inventions once shown as the future.