Re: [bolger] MDO question
On Fri, 6 Jan 2006 08:50:21 -0800 (PST), Phil Smith wrote:
James Greene
> If I could get marine plywood and MDO for the same price, I'd go withI wouldn't unless I wanted a bright finish, because the MDO is a lot easier to finish with paint since it's already got a smooth and uniform surface vs. plywood which will have grain patters, possible patches, etc.
> the marine plywood.
James Greene
--- Inbolger@yahoogroups.com, "John B. Trussell"
<John.Trussell@w...> wrote:
heavy) and is not embosed on the face so paint and glass do not stick
as well. Most HDO is 1" to 1-1/4" thick.
Jon
<John.Trussell@w...> wrote:
>recently
> Ronzo--There are periodic threads about MDO on this group. I
> completed a stitch and glue boat using Olympus MDO plywood. Thisproduct
> is used to make highway signs and obviously TransportationDepartments have
> more clout with plywood manufacturers than amateur boatbuilders. Ifind
> that it is very nice to work with if you ignore the smell of what Isuspect
> is urea formaldahyde glue when you cut it.acceptable
>
> I chose it because the sanding and filling necessary to get an
> paint job is my least favorite part of boatbuilding. MDO cuts thistime
> significantly.some
>
> I would caution you that MDO comes in several variations, including
> that is intended for concrete forms. I don't know if this would besuitable
> for boatbuilding. My experience is limited to highway signmaterial, and I
> like it.That that is used for concrete forms is not MDO it is HDO (H for
>
> John T
heavy) and is not embosed on the face so paint and glass do not stick
as well. Most HDO is 1" to 1-1/4" thick.
Jon
The mdo I have used has the paper impregnated overlay that is not
totaly waterproof but prevents checking and the epoxy soakes into it
and bonds well. Curently I am building a 32'X 9' at the top
sternwheeler with 1/2" mdo sides and 2 layers of single faced 3/8 cold
molded bottem. I am going to glass the hull with 6# doubeling bow stern
and chines for durability when beaching.
Jon
totaly waterproof but prevents checking and the epoxy soakes into it
and bonds well. Curently I am building a 32'X 9' at the top
sternwheeler with 1/2" mdo sides and 2 layers of single faced 3/8 cold
molded bottem. I am going to glass the hull with 6# doubeling bow stern
and chines for durability when beaching.
Jon
Ronzo--There are periodic threads about MDO on this group. I recently
completed a stitch and glue boat using Olympus MDO plywood. This product
is used to make highway signs and obviously Transportation Departments have
more clout with plywood manufacturers than amateur boatbuilders. I find
that it is very nice to work with if you ignore the smell of what I suspect
is urea formaldahyde glue when you cut it.
I chose it because the sanding and filling necessary to get an acceptable
paint job is my least favorite part of boatbuilding. MDO cuts this time
significantly.
I would caution you that MDO comes in several variations, including some
that is intended for concrete forms. I don't know if this would be suitable
for boatbuilding. My experience is limited to highway sign material, and I
like it.
John T
completed a stitch and glue boat using Olympus MDO plywood. This product
is used to make highway signs and obviously Transportation Departments have
more clout with plywood manufacturers than amateur boatbuilders. I find
that it is very nice to work with if you ignore the smell of what I suspect
is urea formaldahyde glue when you cut it.
I chose it because the sanding and filling necessary to get an acceptable
paint job is my least favorite part of boatbuilding. MDO cuts this time
significantly.
I would caution you that MDO comes in several variations, including some
that is intended for concrete forms. I don't know if this would be suitable
for boatbuilding. My experience is limited to highway sign material, and I
like it.
John T
----- Original Message -----
From: "ronporterus" <ronald.porter@...>
To: <bolger@yahoogroups.com>
Sent: Friday, January 06, 2006 10:51 AM
Subject: [bolger] MDO question
> MDO has been mentioned on this list several times but I am confused as
> to its recommended use in boatbuilding. I think I remember one
> 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 types of
> plywood. There is no significant difference in cost in this area
> 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 posed
> elsewhere since the plans are not from Bolger.
>
> ronzo
>
> 1 mouseboat
> 1 pirogue
>
>
>
>
>
>
> Bolger rules!!!
> - no cursing, flaming, trolling, spamming, respamming, or flogging dead
> horses
> - stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
> - Pls add your comments at the TOP, SIGN your posts, and snip away
> - Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax:
> (978) 282-1349
> - Unsubscribe:bolger-unsubscribe@yahoogroups.com
> - Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com
> Yahoo! Groups Links
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>
I bought what the Fort Worth, Texas, lumber yard claimed was 1/4" "marine"
plywood for my first boat. I'd have been better off using old newspapers.
It was garbage!
The 3/4" double sided MDO I bought from a dealer in Louisville, KY, is
beautiful stuff. Many, many impeccable layers. (That means I'm too lazy to
go out to the barn and count them.) About half the cost of Occume.
Roger
derbyrm@...
http://home.insightbb.com/~derbyrm
plywood for my first boat. I'd have been better off using old newspapers.
It was garbage!
The 3/4" double sided MDO I bought from a dealer in Louisville, KY, is
beautiful stuff. Many, many impeccable layers. (That means I'm too lazy to
go out to the barn and count them.) About half the cost of Occume.
Roger
derbyrm@...
http://home.insightbb.com/~derbyrm
----- Original Message -----
From: "Phil Smith" <pbs@...>
> If I could get marine plywood and MDO for the same price, I'd go with the
> marine plywood.
>
> Phil Smith
>
> ----- Original Message ----
> From: ronporterus <ronald.porter@...>
> To:bolger@yahoogroups.com
> Sent: Friday, January 06, 2006 10:51:46
> Subject: [bolger] MDO question
>
> MDO has been mentioned on this list several times but I am confused as
> to its recommended use in boatbuilding. I think I remember one
> 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 types of
> plywood. There is no significant difference in cost in this area
> 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 posed
> elsewhere since the plans are not from Bolger.
>
> ronzo
>
> 1 mouseboat
> 1 pirogue
>
>
>
>
>
>
> Bolger rules!!!
> - no cursing, flaming, trolling, spamming, respamming, or flogging dead
> horses
> - stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
> - Pls add your comments at the TOP, SIGN your posts, and snip away
> - Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax:
> (978) 282-1349
> - Unsubscribe:bolger-unsubscribe@yahoogroups.com
> - Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>
>
>
> Bolger rules!!!
> - no cursing, flaming, trolling, spamming, respamming, or flogging dead
> horses
> - stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
> - Pls add your comments at the TOP, SIGN your posts, and snip away
> - Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax:
> (978) 282-1349
> - Unsubscribe:bolger-unsubscribe@yahoogroups.com
> - Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com
> Yahoo! Groups Links
>
>
>
>
>
>
If there was a Bolger FAQ, the MDO question would be listed first, so
searching the archive will reveal lots.
MDO is resin impregnated paper overlay on plywood, which is think is
quite similar to a resin impregnated cloth overlay on plywood.
FWIW, when I asked Phil Bolger if I could use MDO plywood on Topaz
Sypder he replied that he favored epoxy and glass cloth on that boat.
searching the archive will reveal lots.
MDO is resin impregnated paper overlay on plywood, which is think is
quite similar to a resin impregnated cloth overlay on plywood.
FWIW, when I asked Phil Bolger if I could use MDO plywood on Topaz
Sypder he replied that he favored epoxy and glass cloth on that boat.
If I could get marine plywood and MDO for the same price, I'd go with the marine plywood.
Phil Smith
----- Original Message ----
From: ronporterus <ronald.porter@...>
To:bolger@yahoogroups.com
Sent: Friday, January 06, 2006 10:51:46
Subject: [bolger] MDO question
MDO has been mentioned on this list several times but I am confused as
to its recommended use in boatbuilding. I think I remember one
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 types of
plywood. There is no significant difference in cost in this area
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 posed
elsewhere since the plans are not from Bolger.
ronzo
1 mouseboat
1 pirogue
Bolger rules!!!
- no cursing, flaming, trolling, spamming, respamming, or flogging dead horses
- stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
- Pls add your comments at the TOP, SIGN your posts, and snip away
- Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
- Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com
Yahoo! Groups Links
Phil Smith
----- Original Message ----
From: ronporterus <ronald.porter@...>
To:bolger@yahoogroups.com
Sent: Friday, January 06, 2006 10:51:46
Subject: [bolger] MDO question
MDO has been mentioned on this list several times but I am confused as
to its recommended use in boatbuilding. I think I remember one
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 types of
plywood. There is no significant difference in cost in this area
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 posed
elsewhere since the plans are not from Bolger.
ronzo
1 mouseboat
1 pirogue
Bolger rules!!!
- no cursing, flaming, trolling, spamming, respamming, or flogging dead horses
- stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
- Pls add your comments at the TOP, SIGN your posts, and snip away
- Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
- Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com
Yahoo! Groups Links
--- Inbolger@yahoogroups.com, "ronporterus" <ronald.porter@m...>
wrote:
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.
http://www.noahsmarine.com/United_States/Plywoods-us/plywoods-us.html
http://www.greatnorthernlumber.com/crezon.htm
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.
Nels
wrote:
>confused as
> 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,
>
> 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.
http://www.noahsmarine.com/United_States/Plywoods-us/plywoods-us.html
http://www.greatnorthernlumber.com/crezon.htm
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.
Nels
MDO has been mentioned on this list several times but I am confused as
to its recommended use in boatbuilding. I think I remember one
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 types of
plywood. There is no significant difference in cost in this area
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 posed
elsewhere since the plans are not from Bolger.
ronzo
1 mouseboat
1 pirogue
to its recommended use in boatbuilding. I think I remember one
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 types of
plywood. There is no significant difference in cost in this area
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 posed
elsewhere since the plans are not from Bolger.
ronzo
1 mouseboat
1 pirogue