Is there a difference between Epoxy made in the USA and China?

Yes there is, if the environment is important to you then that should be concern #1, countries like China do not follow the same strict guidelines for chemical companies the way the USA does, so you can guarantee that in China there is a detrimental effect on the earth. As for quality, it is night and day. Not only do USA-made epoxies have more quality control and that means, better resistance to ambering, heat, soft spots, and UV damage, it cures better and is more stable. We have heard reports from customers who tried the cheap epoxy from China and broke out into rashes using it. Plus, think of how old the product being imported is, even before you get to apply it to your job, it sits on trains, trucks, docks, ships, and in customs at ports for months. Generally, the USA made epoxy for US-based customers is the freshest and that means better results.