I have heard complaints about 5200 pulling up gelcoat. Personally I have never had that issue. I think that using 5200 over an old silicone joint is weaker than a carefully prepped joint. As the silicone leaves a release agent. The 4200 is a bit lower strength and faster cure so it might be what you want. Again, I don't have a problem removing it. But it sure doesn't peel up like silicone.
To properly address your concern: you won't break the hatch removing it, but it might lift some gelcoat down in the bond line.
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