47600Re: MDO question
- Jan 6, 2006--- In email@example.com, "ronporterus" <ronald.porter@m...>
> MDO has been mentioned on this list several times but I am
> to its recommended use in boatbuilding. I think I remember onetypes of
> posting that stated that MDO is ready to paint - no cloth or epoxy
> required (that may have been used in reference to a builder not
> planning to sheath with FG and epoxy). I have costed various
> plywood. There is no significant difference in cost in this areaposed
> between 1/2 inch marine and 1/2 inch MDO. What are strengths and
> weaknesses of of single faced and double faced MDO?
> My apologies in advance to the group of this question should be
> elsewhere since the plans are not from Bolger.Hi Ronzo,
> 1 mouseboat
> 1 pirogue
What kind of marine plywood are you referring to that is the same
price as 1/2" MDO? The reason I ask is that there is such a broad
range of quality in what is sold as "marine grade" plywood these
days it is a real challenge. For example some retailers of marine
plywood do not even stock marine fir plywood, the quality has
deteriorated so much lately.
Also fir has to be glassed to prevent checking. MDO does not have to
be glassed. However on the downside, MDO will not finish bright as
it is already coated with a resin barrier that hides the grain
completely. MDO looks like drywall when you first see it:-)
Okoume is probably the best marine grade, readily available and the
lightest. Meranti is close for less cost. Then I think MDO is next
except it is fir based and is therefor heavier.
My Micro - made from crezon - is almost 14 years old now and has
spent most summers in the water and most of it's life outdoors. It
is just now showing it could use a new coat of paint - mostly from
sun fading the dark green hull. The hull was completely encapsulated
with 2 coats of epoxy and painted with Brightsides one-part
urethane. Glassed only from keel to waterline and on the deck.
The G1S MDO will likely check on the unsealed side if exposed to
weather, but would work great if you are closing in the interior
like a BirdwatcherII, or doubling up on the bottom.
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