If the hull is hollow, and the walls thin, then fibreglass will add needed strength. Personally, I prefer putting it on the inside because I hate sanding it smooth, but most would put it on the outside.
If the walls are thick, or hull is solid, or filled with a material that is strong and won't shrink or delaminate, then I wouldn't fibreglass it.
You will still need to seal and sand the outside. You have many choices, fibreglass resin, dope, shellac, cyano acrylic, filler primers, bondo, etc...
_________________ Darren (Admiral Hawk) In the not so tropical climate of the Great White North.
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