GRP Hull @ 100%

Reading Half Roth's advice on cjosing a bluewater boat, I am mindful of the benefits of GRP. Strength, beauty, durability* & low cost. 
Roth leaves the door open for good steel hulls, but he is also won't to sail larger boats on serious seas.
The asterix above triggers warnings on conditions that may compromise a GRP boat, namely:-
   Osmosis - a degrading of the hull slowly by chemical decomposition.
   Deck Delamination - due to ingress of water via staunchions, chain plates, hatches & deck fittings, the layers of the deck will part rendering a weaker structure.
   Bulkhead Cracking - many production boats had plywood bulkheads tacked to the hull. Under years of stress & damage these can breakaway & compromise the rigidity of the hull. 
There are several other issues to be aware of pre & post purchase, not all of them unique to GRP. 
As I am limiting myself to a boat 20-30 feet, I think steel can be ruled out due to its weight & poor sailing performance on this scale. 

So, GRP hull material only! 

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