Hey guys, okay, so this is more of a general woodworking question but y'all are the ones who would know best. I need to mix up an oil finish for a custom rocking chair I am building, I am trying to do something like a maloof style finish which is composed of 1/3 pure tung oil, 1/3 Boiled linseed oil, and 1/3 poly/urethane varnish. so I've got the pure tung, and linseed oils no problem, however I'm not sure if the urethane I have is compatible to be mixed in with them, I have some system 3 marine coating spar urethane...does anyone know if that would mix well with the tung and BLO and provide favorable results? I'm of course going to test whatever I do before I go putting it on the chair, but I wanted to know if it would even mix correctly in the first place. Thanks for the help!