Re: MDO without glass?

---

>
> The next boat I build, I will see if I can get MDO light enough to

> the job.
>
> Tom Etherington

I found some 3/8 MDO at our local lumberyard, (the fancy one with the
Maitre De) and used it on the bottom of one half of the Folding
Schooner without glass. I was careful to paint the exposed edges with
resin. It is stiffer than 1/4 Marine ply with cloth and resin on it. I
would happily use the stuff for the whole boat next time. I do think
you want to wear a dust mask when cutting it.

Leander H

--- Inbolger@egroups.com, "Mana Cruising Club" <manacc@x> wrote:

> Sorry, guys... what's MDO?

MDO is Medium Density Overlay. It's plywood with a paper covering
pastd on both sides.

About twenty years ago I was in business for myself. I had a sign
painted for my business on a piece of 1/2 inch MDO. It spent ten
years on posts out in all weather. A couple of years behind a shed
on the ground, and now about 8 years as siding on a utility trailer
that spends all year out of doors. The MDO is still intact. The
original paint is still intact. The regular plywood floor of the
trailer has rotted out. The regulsr plywood sides have checked and
have delaminated around the edges.

The next boat I build, I will see if I can get MDO light enough to do
the job.

Tom Etherington

>My thoughts are, if you are not going to use glass don't bother
>with epoxy.

I'll second this big time! Used alone, epoxy will check, crack, etc.
With even very light glass cloth, it's very tough.

I've been getting good wear from the 6 oz. plus polyester on the
bottom of my teal, but the resin sealed topsides always look bad,
even a month after being painted.

On the otherhand, my scooner that has 3 oz. on the topsides looks
great. No sign of checking, weathering, etc.

Glass needs epoxy, and epoxy needs glass!

YIBB,

David

A Teal called lil'winnie
A Light Scooner called Margaret Ellen

My thoughts are, if you are not going to use glass don't bother
with epoxy.
"Good" MDO really needs no other covering on the paper side other
than paint.

HJ

Wade Leftwich wrote:

> I'm getting ready to buy a bunch of 1/2 inch plywood for a Clam
> Skiff. I'm wondering if I could use MDO and skip the glass. How tough
> is the surface? I'm thinking I'd put on a coat of epoxy, then latex
> paint per Dynamite's recommendation.
>
> Wade Leftwich
> Ithac, NY
>
>

_ _ _ _ _
% Harrywelshman@...

> I've never used them as our ordinary "run of the mill" Radiata

plywood is

> such good quality in terms of voids etc (this is my perception

given what

> I've read about the ply available in North America).

Mr. Bolger allows himself some off-topic remarks in his books. I
emulate him here. Thus, my remarks are on-topic.

One of the characteristics of a free economy is that suppliers tend
to produce for the mass market at a low price.

People who would be happy with a lower quality product find that the
mass market product is just as cheap. They are happy.

A few suppliers will find niche markets for higher quality at a much
higher price. People who want higher quality get shafted.

This explains the plywood market. Most plywood goes into buildings.
Building codes require that most buildings are over-strong. Hence the
mass market is for a rather poor product. It costs a lot more to get
a good product.

Peter

Hello Guys

In New Zealand there are similar products sold as "Signply" and "Formply".
I've never used them as our ordinary "run of the mill" Radiata plywood is
such good quality in terms of voids etc (this is my perception given what
I've read about the ply available in North America).

Foster Price

> -----Original Message-----
> From: Mana Cruising Club [mailto:manacc@...]
> Sent: Wednesday, 22 November 2000 11:02
> To:bolger@egroups.com
> Subject: Re: [bolger] MDO without glass?
>
>
> Sorry, guys... what's MDO?
>
> Jeremy
> Mana, New Zealand
> -----Original Message-----
> From: Wade Leftwich <wade@...>
> To:bolger@egroups.com<bolger@egroups.com>
> Date: Tuesday, 21 November 2000 11:06
> Subject: [bolger] MDO without glass?
>
>
> >I'm getting ready to buy a bunch of 1/2 inch plywood for a Clam
> >Skiff. I'm wondering if I could use MDO and skip the glass.
> How tough
> >is the surface? I'm thinking I'd put on a coat of epoxy, then latex
> >paint per Dynamite's recommendation.
> >
> >Wade Leftwich
> >Ithac, NY
> >
> >
> >
> >
> >
> >Bolger rules!!!
> >- no cursing, flaming, trolling, or spamming
> >- no flogging dead horses
> >- add something: take "thanks!" and "ditto!" posts off-list.
> >- stay on topic and punctuate
> >- add your comments at the TOP and SIGN your posts
> >
> >
>
>
> -------------------------- eGroups Sponsor
> -------------------------~-~>
> eLerts
> It's Easy. It's Fun. Best of All, it's Free!
>http://click.egroups.com/1/9699/5/_/3457/_/974844223/
> --------------------------------------------------------------
> -------_->
>
> Bolger rules!!!
> - no cursing, flaming, trolling, or spamming
> - no flogging dead horses
> - add something: take "thanks!" and "ditto!" posts off-list.
> - stay on topic and punctuate
> - add your comments at the TOP and SIGN your posts
>
>

Sorry, guys... what's MDO?

Jeremy
Mana, New Zealand
-----Original Message-----
From: Wade Leftwich <wade@...>
To:bolger@egroups.com<bolger@egroups.com>
Date: Tuesday, 21 November 2000 11:06
Subject: [bolger] MDO without glass?

>I'm getting ready to buy a bunch of 1/2 inch plywood for a Clam
>Skiff. I'm wondering if I could use MDO and skip the glass. How tough
>is the surface? I'm thinking I'd put on a coat of epoxy, then latex
>paint per Dynamite's recommendation.
>
>Wade Leftwich
>Ithac, NY
>
>
>
>
>
>Bolger rules!!!
>- no cursing, flaming, trolling, or spamming
>- no flogging dead horses
>- add something: take "thanks!" and "ditto!" posts off-list.
>- stay on topic and punctuate
>- add your comments at the TOP and SIGN your posts
>
>

No, it was 1/2" MDO, paper both sides. Maybe a bad run from the mill, but it delaminated real quick. I think a simple boil test would have done the same.

Rick

sonicwonder@... wrote:

> On the other hand I built some shelves out of some 1/2" MDO
> that fell apart after they were out in the rain a few times.
>

Are you sure they weren't made out of MDF (Medium density fiberboard)?
This stuff is basically glued sawdust and SOAKS up water . Completely
unsuitable for boat-building.

eGroups Sponsor

Bolger rules!!!
- no cursing, flaming, trolling, or spamming
- no flogging dead horses
- add something: take "thanks!" and "ditto!" posts off-list.
- stay on topic and punctuate
- add your comments at the TOP and SIGN your posts

> On the other hand I built some shelves out of some 1/2" MDO
> that fell apart after they were out in the rain a few times.
>

Are you sure they weren't made out of MDF (Medium density fiberboard)?
This stuff is basically glued sawdust and SOAKS up water . Completely
unsuitable for boat-building.

There must be different manufacturers of MDO as I have some real durable 3/4" two sided MDO that I lined the bottom of my dump truck with four years ago. It gets loaded and dumped at least a couple times a week; dirt, gravel, shredded mulch. Add the rain and rotting stuff that sometimes sits in it a few days at a time and it still looks great.

On the other hand I built some shelves out of some 1/2" MDO that fell apart after they were out in the rain a few times.

My point is maybe buy one sheet and do some testing.

Rick

Wade Leftwich wrote:

I'm getting ready to buy a bunch of 1/2 inch plywood for a Clam
Skiff. I'm wondering if I could use MDO and skip the glass. How tough
is the surface? I'm thinking I'd put on a coat of epoxy, then latex
paint per Dynamite's recommendation.

Wade Leftwich
Ithac, NY

I'm getting ready to buy a bunch of 1/2 inch plywood for a Clam
Skiff. I'm wondering if I could use MDO and skip the glass. How tough
is the surface? I'm thinking I'd put on a coat of epoxy, then latex
paint per Dynamite's recommendation.

Wade Leftwich
Ithac, NY