I built a Hartley RORC 32' too long ago now and I would suggest that it is not really possible to determine if a Ferro boat is
blue water capable before
purchase.
There is no real
history as with some of the "mass" produced fibreglass
boats.
The following assumes a reasonable level of experience with boats.
What you can do is go through the steps as already discussed in this forum. My understanding is that the process would
work like this ( this really is only looking at the ferro part, the rest needs to be checked by other means)...
1) Generally check the boat, looking for cracks or rust marks.
2) Check that all
deck gear/rigging/etc. is through bolted with appropriate
backing plates.
3) Check that the boat sits properly to it's waterline.
4) Check that an appropriate impervious coating has been applied to the
bilge and the
interior of the boat so that
bilge water never comes into contact with bare cement. (Tar
epoxy on a penetrating
epoxy primer comes to mind.) My understanding is that
oil (esp. diesel) and sea
water will destroy ferro cement.
4) Check that all
equipment on board operates "normally".
5) Take the boat for a test sail, preferably in about 15 knots of breeze with gusts to 23 knots. Particularly watch for tenderness or heavy
weather helm (insufficient ballast/top heavy).
6) If you still like the boat then look for a
surveyor with experience in ferro.
At this point it is probably a go or no go on the
purchase.
If you do buy the boat my opinion is that you need to slowly
work your way through various operating conditions. I'm not suggesting looking for bad weather, rather that as the boat is used in benign conditions that there will be the occasional outlier that will give a good idea as it's capabilities. I would strongly suggest that
buying a boat and immediately doing
blue water cruising is not a good idea. (And I don't think that this applies just to ferro boats.)