Hate to rehash anything that's been covered, but I'm still working through the span of posts... good stuff!

Two main questions at this point

1) Is the Rustoleum Topside (marine) paint that much better than the regular/Professional Rustoleum stuff in terms of durability? I know it has UV protection, but I'm not sure if that's totally necessary for me. I know there are other brands/types out there, but due to availability, I'm going with Rustoleum of some type.

2) Is there any benefit to adding an amount of Penetrol to the thinner/paint? Does it help level, or is it counterproductive?

Thanks for your help... this has been a great read so far, and I still have a ways to go!