It depends on what you're trying to fasten, and where. I dislike using screws in fiberglass, as it really is too brittle IMHO to work properly with screws.
The best way to attach things to the interior of a fiberglass boat is to add wooden stringers or furring strips, by glassing them to the interior, and using wood screws into the furring strip.
Another reason I dislike using screws into fiberglass, is if the laminate is cored, you can create a leak into the core—leading to a very expensive repair
in some cases. However, your boat I think is solid fiberglass. In the case of solid laminate, I don't see why you couldn't use the sleeve and screw technique.
Another way to attach things to the interior is to use adhesives or adhesive mounts to hold them to the fiberglass.
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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.