The tricks all come with problems...I.e. Trying to buff it in, looks nice for a minute but ruins the bond of adjacent coating and the gloss will fail in short order....not recommended.
The repair will be detectable to some extent. It's a boat, not a Ferrari.
It is common to repair "panels" taping off full strips, edge to edge and immediately pulling tape after coating, it "helps" to blend in.
I don't recommend either a brush or roller, unless you roll & tip using a really good brush like a Corona black tip 2" ~$25. This takes a bit of practice, not a good place to learn.
If you use a cheap
brush...more than likely you will get brush marks...
Instead use a Preval disposable sprayer ~$6, works just like a spray can, use the tape pull/panel method. Mask adjacent areas. If you try to "spot it in" you will get ugly dry spray. This is the easiest way for a Awlgrip beginner on a small area. Wear a Niosh respirator...
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