Re: 1982 Glastron Hpv165 bass boat restoration.
Based on the discussions to date, I'd only use the 1608 on the extra reinforcement of the hull, and ONLY if it's bi-axial glass. Elsewhere I'd stick w/ the 1708. Is 1oz less glass going to offer substantially less strength then 1708 layups? No, probably not, but how much trust to you put in probably?
Don't forget, that low cost, inexpensive, left over glass can be problematic unless it's been stored well wrapped, and not exposed to moisture. As an add-on, just because we can, extra layer of glass on the whole hull to reinforce it, I would be inclined to trust it to be sufficient. For my stringers, transom & bulkheads, the boat's primary support system, I'd be less inclined to use it.