Re: bottom painting question
If you gently "stroke" the paint immediately after rolling, with a paintbrush then the bubbles and the orange peel go away to leave a mirror finish. It is a technique called "roll and tip". It takes a little practice, but even a novice can get a really nice finish.
Brightside will work fine, and is (relatively) cheap and easy. A 2-part is slightly more difficult to handle, not as easy to recoat, but gives a tougher finish.