Don't use polysulfide-based sealants on anything plastic, since it tends to attack plastics. I'd use 4200 or 4000UV instead of polysulfide, since it is safe for metals, wood, plastic, fiberglass.
Countersinking all the fastener holes, so it forms a "natural" o-ring is a very good idea. However, if you do that... don't follow the older practice of tightening the screws partially and then waiting for the sealant to cure... just tighten them all the way down to begin with.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.