WOW the Ecopoxy is kick ass good stuff!! The lay-ups or glass work was set in 12 hours. The hardener I have is the medium and it set up as the specs said it would. No smell and very sticky after only 30 minuets. I emailed the supplier about micro balloons being added and had no response, now I know why!!!! The stuff generates its own heat when micro balloons is added so small amounts should be mixed at an application. There is no smell and nice to work with.