A buddy handed me a tube of this stuff and gave me a little sermon on
its virtues compared to 5200. Apparently it is used in the auto
industry and it sticks well to metal. Has anyone here been using it
on boats and if so how's it holding up?

-- Tom.

When I replaced the gaskets on my aluminum skylights, the company insisted
that only Silaprene would do the job. I couldn't find it anywhere and
bought a tube from them for 20 bucks. So far (two seasons), no sign of the
gaskets coming loose. It's used a lot to attach window glazing into high
rise curtain walls if I remember the refererences during my search
correctly.

--
Roger Long

On Jul 8, 12:31*pm, "Roger Long" wrote:
When *I replaced the gaskets on my aluminum skylights, the company insisted
that only Silaprene would do the job. *I couldn't find it anywhere and
bought a tube from them for 20 bucks. *So far (two seasons), no sign of the
gaskets coming loose. *It's used a lot to attach window glazing into high
rise curtain walls if I remember the refererences during my search
correctly.

--
Roger Long

Thanks for that. I googled Silaprene and the prices are all over the
place but you can get it for about $9 a tube plus shipping. AFIK, it
seems to mostly be an automotive product. So, my worry is that it
might not really be up to long term immersion... Good to hear that it
works on your skylights.

-- Tom.

On Jul 8, 8:54*am, " wrote:
*Has anyone here been using it
on boats and if so how's it holding up?

-- Tom.



YES,

A few years ago I needed to rebed my chain plates.They were the
through the deck type. What caught my eye was a brief reference I read
to an aritcle in some small boating magizine to Silaprene and its
virtues. I researched Silaprene extensivily for a couple months
talking to both their tech guys and Dow Corning, 3M, and a bunch of
other tech guys.

I posted my finding here. Just do a search and youll find all the Lap
Strength.... Elongation..... etc specs.

Bottom line is Silaprene is vastly superior to many adhesive typically
used for chain plate to fiber glass bedding.

Now comes the phiosophy arguments:
1) NEVER USE 5200 or others to seal becuase its so terrible to remove.
Because it WILL fail.

To that I say based on my application and product specs the reason why
5200 fails is because it is not designed for that application and is
simply not tuff enough for the job.

When you look up the numbers on the product youll find that Silaprene
has a higher temp range than 5200. What the big deal with that? Temp
on decks on a sunny day can EXCEED the temp range for 5200 and it DOES
fail unlike Silaprene .
SInce I have redesigned my trough deck chain plate and used Silaprene
its been dry as a bone but mine is only about a 3 year study. However,
if you actuyally do the reasearch and compare the SPECS of each of the
more common sealants I bet you draw the sam conclussion as I.

I may have plsted in RBbuilding and not RBC I cant remember. But its
all there.........
Bob
PS have you noticed that several people posted here but none answered
your question. They fixated on 5200 prob because that is all they
know.

This makes good sense with what I heard from the skylight people (Atkins
Hoyle) since metal skylight frames can get pretty damn hot.

Do you know a source for Silaprene? I was unable to find it anywhere other
than wholesale quantities except from Atkins Hoyle.

--
Roger Long

On Jul 9, 8:06*am, "Roger Long" wrote:
...
Do you know a source for Silaprene? *I was unable to find it anywhere other
than wholesale quantities except from Atkins Hoyle.

Don't know if these help but google shopping gives:
http://www.google.com/products?hl=en...-8&sa=N&tab=wf

or

http://tinyurl.com/6xn5xw

--Tom.

On Jul 8, 8:54*am, " wrote:


Hi Tom,

You caught me in an usually benovolent and kind mood today........

Below is a post from 2005 that may be of help:


Hello:
Any thoughts on this.
Chainplates are a source of leaks and equal source of debate on how
to
fix the leak.
Some people say use polysulfide because if you use 3M5200 you'll be
tearing your boat apart to rebed plates in a few years.
Others say the reasons why plates leak is because polysulfide do not
have required strength. The only way to solve plate leaks is to use
3M5200. Why? It has a much stronger bond.
Others say that 3M5200 loses its bond eventually and it too will
leak.
Only this time the boat owner has a major problem removing the old
adhesive to rebed.

Here is the question....... Why would 3M5200 bond fail?


I called 3M tech people and they sent Tech Data Sheet (effective:
12/1/2004). Interesting data.
I also called Royal Adhesive and received data for Silaprene.
This is what I read.


Stainless to Stainless Overlap Sheer Strength
3M5200.........352 psi
Silaprene......488 psi


Interesting.


What about temperature. I was painting my garage last summer. Ambient
temp was 94 degrees F. I hung a thermometer on the side of the garage
in direct sun. Temp of garage wall was 150 degrees F. OUCH!


How hot do chainplates and decks get in many parts of the world
during
the hot season? 130-150-180F? Just a guess. How does temperature
effect
plate adhesive bond? I got more TDS stuff.


3M data: (Service temperature -40F to 190F) "Heat resistance-Due to
the decreased value in bond strength at elevated temperature, we do
not
recommend use of this product above 190F."


Silaprene data: (Service temperature -60F to 250F) " Heat
resistance-No significant loss of bond strength until 300 degrees F."


Elevated Temperature Shear Strength
3M5200......................(70F = 240psi) (150F = 176psi) (190F =
139psi)Teak
test substrate.
Silaprene.............(70F - 250F)No significant shear strength loss.
READ THIS AGAIN !


Question. Could 5200 fail because deck and plate temperatures reduce
its bond strength?


Has anybody used Silaprene?


Comparing data each company supplied says Silaprene has greater bond
strength than 5200 on stainless steel and keeps its strength at
temperatures when 5200 begins acting like butter (exaggeration).


Ideas about the deck temperatures causing 5200 failure
Should I use Silaprene to rebed my chainplates "forever?"

Bob

On Jul 9, 8:18*am, Bob wrote:
On Jul 8, 8:54*am, " wrote:

Hi Tom,

You caught me in an usually benovolent and kind mood today........
...

Thank you very much. Nice post. Kind of you to re-send it.

-- Tom.

On Tue, 8 Jul 2008 09:54:30 -0700 (PDT), "
wrote:

A buddy handed me a tube of this stuff and gave me a little sermon on
its virtues compared to 5200. Apparently it is used in the auto
industry and it sticks well to metal. Has anyone here been using it
on boats and if so how's it holding up?

-- Tom.

Not directly addressing your question, and a bit outdated concerning
new products, but this might be useful when considering
adhesives/sealants for various boat applications.

http://www.boatus.com/goodoldboat/sealant.asp

--Vic

On Jul 12, 3:24*pm, Vic Smith wrote:
...might be useful when considering
adhesives/sealants for various boat applications.

http://www.boatus.com/goodoldboat/sealant.asp

Nice link. Thanks.

-- Tom.