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

[Alan Goodman]

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