Hello Mike,
I realize this thread is a few months old now, but some comments ...
Regarding Waterlox UTOS, it is not a standalone finish unless you go in with the understanding it is not waterproof. Needs to be followed up with successive coats of Waterlox original products, H20-lox, or perhaps another top coat of choice. It mainly seems to be targeted as a lower VOC option with more consistent penetration as a first coat, and faster cure. I sometimes use one coat of Waterlox original to provide a little more grain pop, depth and color, and to seal the fibers before applying water based products. I also achieve something similar with dewaxed shellac (more affordable), just depends on how rich a base color I want to start with.. Anyways, UTOS now provides another option that's faster drying than the "original", potentially requires less product per application, no dust since you buff in, and lower VOC.
Regarding TARGET coatings, I too tried to contact them for 2 months over the summer with no response; (multiple calls and email). When I got their answering service the final time, I expressed dissatisfaction that I had been trying to get technical support for months to no avail, and they said they would relay that info promptly. I got a call back within in an hour ... Not sure what is going on there, maybe short staffed with COVID, I don't know ... I was also asking about their EM9300 exterior topcoat, and being able to adhere over epoxy or oil. In terms of oil, they stated let dry for 72 to 100 hours, then using their products over top should be fine. This is a pretty standard recommendation for most water over oil applications.
Regards