[C320-list] 3M 4200 fast cure (jim brown)

[Jeff Hare]

The deck isn't balsa anywhere near where hardware is attached or chain
plates go through on newer boats.  All the 320s have balsa core roughly
wherever the non-skid pattern is (I believe) as we saw when Gerry gave us a
tour of the 320 mfg line.   All the raised areas where hardware is attached
also have aluminum plates embedded in the deck that can be drilled/tapped.

If #62 has balsa at the chain plates, perhaps the change happened around the
time when the grid liner was changed and the deep bilge was added?  The
factory could answer this question.

I would think that Amanda Lu does not have balsa near the chain plates since
at least one hull in the 400s I know of was re-bedded and had solid glass
there.

It would be interesting to track down an answer for this however so we could
help people know what's in store for their hull when re-bedding hardware.

-Jeff



-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of William Ott
Sent: Saturday, June 22, 2013 3:08 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] 3M 4200 fast cure (jim brown)

I also plan to rebed my shrouds soon.  I didn't know that deck was balsa
sandwiched.  Are all C320's this way ?  If not, does someone know when they
switched to solid glass ?

Mike Ott
'Amanda Lu'
#508

Sent from my iPad

On Jun 20, 2013, at 5:17 PM, jim brown <jbrown5093 at yahoo.com> wrote:

>  I just ordered 30ft of 3/4 inch butyl tape from an RV supplier for $7 so
I'll be able to make plenty of mistakes and still have some to share.
Actually it's cheaper than the small tube of either 4200 or 4000. If all
goes well I may rebed all the shroud deck fittings since I can see a little
rust on the edges of the interior fittings in a couple of places. I thought
it might be from condensation in the winter since I haven't actually seen
any leaks during rains or wash downs but that may be wishful thinking. . 
> 
> Jim Brown
> 
> 
> 
> 
> ________________________________
> From: Alan Goodman <goodmanalanlee at hotmail.com>
> To: "c320-list at lists.catalina320.com" 
> <c320-list at lists.catalina320.com>
> Sent: Thursday, June 20, 2013 1:31 AM
> Subject: [C320-list] 3M 4200 fast cure (jim brown)
> 
> 
> 
> Jim - I agree 100% with Jon.  I just completed rebedding both aft lower
shrouds and 2 stanchions.  If you go with sealant in a tube, 4000 is the way
to go.  If you look at 3M's technical document (on line at 3M) it
specifically states it is designed for high flex sealing applications and
its data sheet shows amazing elongation prior to sealant failure (which a
shroud application is subject to).   I used the butyl tape (from SailRite)
and found it much easier and cleaner to use than sealant in a tube.  You
need to consider whether you have had any water penetration into the deck
core (my hull 67 is not solid fiberglass at the shrouds but rather wood
cored.  I removed the factory sealant which fills the entire chain plate
slot in the deck (tough job), removed wet core and filled/sealed with epoxy,
used an industrial self-leveling tube sealant to refill the  chain plate
slot in the deck, and then butyl tape to seal the slotted rectangular cover
> plate.  Very pleased as we have recently experience days of torrential 
> rains and not a drop.  I installed the chain plate with washers inside 
> the cabin between the bottom of the interior fiberglass and the top of 
> the interior chain plate flange to as to keep an open space for water 
> to leak out should the seal fail (and my previous sealant efforts 
> using a different technique did indeed leak and I was able to  easily 
> observe drips inside the cabin indicating I had not been successful).  
> Alan
> 
>> 
>> Message: 3
>> Date: Wed, 19 Jun 2013 09:15:57 -0400
>> From: "Jon Vez" <jonvez at comcast.net>
>> To: <C320-List at Catalina320.com>
>> Subject: Re: [C320-list] 3M 4200 fast cure
>> Message-ID: <003e01ce6cef$23050c40$690f24c0$@net>
>> Content-Type: text/plain;    charset="us-ascii"
>> 
>> You might want to consider using Butyl Tape. This is what the factory 
>> is now using. If you google 'Bed it with Butyl' or go to the Compass 
>> Marine website, there is an excellent tutorial by 'Maine Sail' on 
>> using it. If you want to stick with a sealant, try 3M 4000UV. You do 
>> not need strength, just flexibility and sealing....Have not heard about
4200 being discontinued....
>> 
>> Good luck...
>> 
>> -----Original Message-----
>> From: c320-list-bounces at lists.catalina320.com
>> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of jim 
>> brown
>> Sent: Wednesday, June 19, 2013 8:46 AM
>> To: c320-list at catalina320.com
>> Subject: [C320-list] 3M 4200 fast cure
>> 
>> My starboard deck fitting for the lower aft shroud is leaking 
>> slightly in heavy rains. I had planned to rebed the deck fitting 
>> using 3M 4200. Three area WM stores are out of it in the 3 oz tube 
>> (don't need the large size) and 2 stores said that 4200 has been 
>> discontinued by 3M (however it's still listed on the 3M website). Any 
>> information on what to replace it with (don't want to use 5200) and
whether the rumor is true?
>> 
>> Jim Brown