I just finished a light fixture I got from the same place!
I like the durability (my family is rough) of polyurethane, although it can be a pain to apply.
BTW, I got the above light fixture shade from the same place (joineryplans) and my wife is crazy about it! I’ve got to do a few more of these type light fixtures for her now. I guess I’ll be a pro at making them by the time I get them all done!
At least I know somebody else is using that site! I love it!