no no no no
Those older hand laid boats are of INFERIOR strength in comparison to
'modern' composites.
The problem with older hand laid boats is that the layup crew only
worked 8 hours per day, leaving the various schedules to 'cure' before
applying the next layers. Plus if the layers got too thick the heat
generated accelerated the cure and forced a 'rest' until the substrate
returned to 'normal' temperatures.

Just about everone nowadays will agree that new polyester doesnt adhere
to 'old' cured polyester.

So the resulr was poor bond strength between the layers of layup ----
comparatively POOR structure. Plus by itself polyester resin isnt very
strong and the lay-ups contained "too much resin" - another
'weakening'.

Nowadays, good yards will use refrigeration and will continuously
lay-up until the job is completely done - nonstop. Plus, they employ
vacuum bagging, etc. which ensures the correct ratio of glass to resin
- yields the strongest (probably longest lasting) structure..

Cosmetically, gelcoat is very porous and unless continuously waxed to
seal the 'pores' will ultimately oxidize very deep into the gel ......
'aligator' (micro-cracks). Plus the wax will ultimately change
chemical composition and then increase the oxidiation of the gelcoat.
The remedy for life preservation of surface gelcoat is to wax often and
also 'strip' and remove the old dead wax periodically by 'caustic
strippers', then rewax. The 'stripping' probably needed at every 18
months minimum ....... or ultimately the gelcoat will oxidize deeply
and then you form 'alligatoring'' - but you need at least a pocket
microscope to find it.



In article , Larry
wrote:

Courtney Thomas wrote in
news
what's
gonna kill 'er ?



The old fiberglass boats were made of many layers of carefully hand-laid
fiberglass, glass mat saturated with epoxy. But, as the accountants
replaced the boat builders when outside companies, like Brunswick for
instance, bought up the company names the boat builders had carefully
guarded with high quality hulls, the accountants started whittling away at
costs trying to squeeze every profit dollar they could out of the boats.
Quality, of course, suffered. Boat hulls became thinner and thinner. We
could save a bundle if we stopped using fiberglass, which is expensive, so
much. Hulls, like the decks above them, became cored with all kinds of
crap from foam to plywood to balsa wood to something now that looks like
putty (http://www.yachtsurvey.com/Fiberglass_Boats.htm shows what Sea Ray
has done, gelcoat on the outside, putty then one lay of fiberglass trying
to fool the surveyors into thinking it's fiberglass. Look at the pictures.
It ain't fiberglass, much)

Boaters, some of the cheapest cheapskates on the planet, always looking for
a real bargain, fell in love with the cheapest of the cheap, Bayliner,
which is SO successful it nearly put the others, the quality small boats,
out of business. Boaters share in the blame for what the hulls have
become...

New boats made of poprivets, putty and plastic are designed to last to the
end of the payment books....like everything else America creates.

Pieces of CRAP!

Rich Hampel wrote:
no no no no
Those older hand laid boats are of INFERIOR strength in comparison to
'modern' composites.
snip
I'm not sure you can make such a blanket statement of condemnation of
the quality of older boats. When I was picking up my vintage '66 HR28
in the yard, I noticed a mid-eighties Beneteau being stripped of hull
exterior and core from waterline to waterline aft of the keel. Poor
quality materials leading to failure. Granted that's only one boat, but
I have seen many more "modern" boats undergoing this type of radical
surgery than older ones. My understanding is that pre-70's oil embargo
boats were built with a type of resin that was superior to that
available post-70's. Your comments about an 8 hr workday and curing
times may be true, but another consideration is that as an emerging
technology, builders just didn't know how strong fibreglass was/is and
tended to overbuild. I found out putting a depthsounder into my hull
that there are sections of solid glass almost 3cm thick where the hull
flares toward the keel. As far as gelcoat is concerned, mine is in
shockingly good condition for being a 39 year old boat, with no signs of
spidering or crazing.

At any rate some are convinced of the strength and reliability of older
boats like the HR28 such as these two guys for instance. If your French
isn't any good, the one guy went to South Africa and back without a
motor, and the other guy is currently doing a non-stop there and back
across the North Atlantic.

http://petitdelire.com/

http://www.cafesmersdusud.com/oceanothon.htm

Rich Hampel wrote in
:

no no no no
Those older hand laid boats are of INFERIOR strength in comparison to
'modern' composites.


Those old boats were just awful. One old 38 Hatteras got loose during one
of Charleston's near miss hurricanes, floated out of its marina and nearly
beat the bridge in half next to the marina before the storm was over. Its
flybridge and bimini was pretty trashed but not one drop of water was in
her bilge from any hull failure. The creosote poles she was beating
against in fairly heavy waves were sheared off!

Let's test your theory with a brand new 40' Brunswick Boat made of these
wonderful materials like is in the webpage I quoted. How about let's play
fair and use a new Sea Ray, not just a Bayliner. I'll call when the next
storm comes in. SCDOT replaced the poles with new ones for the test,
already.

I'd ride safely on that old Hat anyplace.....
--
Larry