I haven't tried a lot a finishes, but spar has worked well for me, so I'm sticking with it. I started with spar after it scored very well in a finish durability test I read. The rattle can is the easiest glossy finish that I have found. The trick for me is to keep my coats light. Between coats I buff very lightly with steel wool just enough to dull it up, and use on average 3 coats. I made the mistake early on of being a little too aggressive with the steel wool, which led to some scratching. When things are done right it provides a glass smooth, durable finish. Keep at it, and I think you will be happy with the finish.