Re: [bolger] Re: Hour 40
>I'm using a lot of this glue on the Wyoming. I do limit it to
> --- In bolger@y..., David Ryan <david@c...> wrote:
>> >Polyurethane glue; and it is new to me. Someone here
large gluing surfaces such as where the 1 1/2" square stock is
glued down to the hull and nailed also, or the 1x4 stock is
glued to bulkheads. I did some test and where there is good
size gluing surfaces it holds as well as epoxy. The wood will
separate before the joint gives. This is on plywood and
cedar. I think hardwoods would do better with epoxy.
Any places that require waterproof assembly or where I'm going
to use fillets and tape, I use epoxy. Without a doubt epoxy is
a better glue, but, in large gluing surfaces, the polyurethane
will hold very well and is stronger than the wood, which after
all is all you need from a glue.
I find the polyurethane allows me to build much faster than
epoxy. Within a couple hours it's set well enough to remove
clamps and continue building. On a big boat like the Wyo,
thats a huge advantage.
>It is not cheaper than epoxy by any means. BUT, it's much
>>Polyurethane glue; and it is new to me. Someone here
>>recommended it a few weeks back. I am using a 'generic'
>>version of the brand name stuff, $7 a pint. I like that it
>>has GREAT adhesion, it is *really*
> At $7/pint that's $56/gallon -- more than Raka epoxy. Why
> not use epoxy?
easier to work with and it sets up in a couple hours and you
can continue building. That's the advantage. Where I use it,
I would use more epoxy because of the waste. I never seem to
be able to mix up the exact amount needed. With a squeeze
bottle you use what you need. It's still more expensive but
not terribly so and you pay for convenience.
- Yes, but does it have any strength when the parts don't have a tight
fit? Epoxy is pretty good stuff for filling small gaps (or large ones,
if you can afford it).
--- In bolger@y..., <boatbuilding@g...> wrote:
> >>Polyurethane glue; snip
- --- In bolger@y..., David Ryan <david@c...> wrote:
> At $7/pint that's $56/gallon -- more than Raka epoxy.Whim and not much else. I think the Gorilla Glue swells up by 3 or 4
> Why not use epoxy?
times, so a pint equals perhaps a quart of thickened epoxy. Also, I
feel that dealing with a squeeze bottle, versus mixing up a batch
from two parts, is a little easier.
The real reason I switched, was that day last weekend when I was
working outdoors in the pouring rain, with very wet wood. The glue
joint I made with epoxy fell apart; disgusted, I ran to the store and
bought the Gorilla Glue and discovered that it sticks even better
when things are wet.
- I have used gorilla glue as well as epoxy, and PL premium.
My experience indicates that the epoxy is the strongest. The PL is
is a little sensative to surface prep, it doesn't seem to like laytex
paint. I found that the GG used in loose joints is shock sensative.
I found this out the hard way, my 15' skiff slid off of the saw
horses I had it on. Where I only used GG to join the frames and
there were gaps, the shock of the fall knocked the frames off of the
plywood sides. Where I used 3M 5200 there was no problems. I had
used 5200 on the port side and GG on the starboard side. The GG
joint separated without damaging the underlying wood.
From working with all the above glues, I have come to like 3M 5200.
The regular version sets in 4 hours and takes up to 4 days to fully
cure. The fast cure 5200 sets in 45 minutes and cures in one day.
It will bridge gaps of up to 3/8" or 9mm. When it cures it does not
foam. When cured, it has the consistancy of the rubber used in
skateboard wheels. On bare wood, removing it requires taking away
some of the underlying wood. The downside to this glue, is you
should clean up right away, it is a bear to sand off drips.
>--- In bolger@y..., "brucehallman" <brucehallman@y...> wrote:
> --- In bolger@y..., teakdeck@a... wrote:
> > Gorilla glue.
> Polyurethane glue; and it is new to me. Someone here recommended
> a few weeks back. I am using a 'generic' version of the brand name*really*
> stuff, $7 a pint. I like that it has GREAT adhesion, it is
- Sorry Bruce, but I cannot understand your logic at all on this one.
All epoxy labels say the wood must be dry.
Gorilla labels say the joint should be damp.
What would you expect?
--- In bolger@y..., "brucehallman" <brucehallman@y...> wrote:
> --- In bolger@y..., David Ryan <david@c...> wrote:
> The real reason I switched, was that day last weekend when I was
> working outdoors in the pouring rain, with very wet wood. The glue
> joint I made with epoxy fell apart; disgusted, I ran to the store
> bought the Gorilla Glue and discovered that it sticks even better
> when things are wet.
- --- In bolger@y..., "brucehallman" <brucehallman@y...> wrote:
> I am still plugging away at my lapstrake learning experiment withA great resource for learning how to lay out and spile strakes is
> Spur II [BWAOM]. My strakes are very far from 'correct', but never
> the less, I think the boat will float. I learned enough about how
> strakes fall on frames that "next time" I bet I can make proper
> strakes [perhaps]. The boat is extremely light weight.
> I think that using 1/8" plywood to "plank" a boat is quicker than
> using 1/4" redwood strips. Gorilla glue is excellent stuff.
"The Clinker Plywood Boatbuilding Manual" by Iain Oughtred. It also
has a wealth of information on building lapstrake plywood boats. It
is available at Amazon and the WoodenBoat Store.