Spar urethane w/ Rustoleum

[snag]

I am going to start on a new batch of wood arrows. So I decided to do an experiment. I sealed a dowel w/ oil-based Minwax stain, painted w/ oil-based Rustoleum, then sealed with Spar urethane. It was all compatable and it looks good. What I didn't do was use some Testors enamel with the Rustoleum before I sealed it with Spar. Do you think it will be compatable with the Spar and the Rustoleum?