[Rhodes22-list] How bad is my CB plate?

[The Rhodes 22 Email List]

Dennis,
 
I can only speak from personal experience, but fiberglass does not adhere  
well to gel coat. It has to be ground down to the fiberglass in order to 
have  any structural integrity.
 
Rummy
 
 
In a message dated 1/19/2015 6:47:34 P.M. Eastern Standard Time,  
rhodes22-list at rhodes22.org writes:

Graham  found that excellent fiber glassing video on YouTube in the link he
shared.  If you go to the author's website, you'll find another video about
bonding  gelcoat over epoxy successfully. Check it out  at
http://boatworkstoday.com/archives/1680. Unfortunately, he didn't  document
the reverse (putting epoxy over gelcoat), but that information may  be
elsewhere on the web.

Dennis
Magic Moments
Thinking about  taking up ice fishing.


-----Original Message-----
From:  rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org]  On Behalf Of The Rhodes 22 
Email
List
Sent: Monday, January 19, 2015  11:26 AM
To: 'The Rhodes 22 Email List'
Subject: Re: [Rhodes22-list] How  bad is my CB plate?

James:

I did a little further checking into  using epoxy with matt and it seems we
are both right. Apparently you can  use the matt if you take particular care
to apply the epoxy so that it  penetrates thoroughly and the work does not
involve sharp corners. Matt has  polyester threads in it that dissolve with
polyester resin but not with  epoxy with the result that it will not take a
form properly with epoxy but  will be strong and solid on flat surfaces.
Looks like it also builds  thickness faster than woven roving. I think I
still prefer to use the  rovings in most situations but if I have to fill a
large hole  such as  that created when I removed the inner chainplates, matt
would have been a  better for the deep part with rovings near the surface.

Here is an  excellent explanation embedded into a useful video on making
common  fibreglass repairs using  epoxy.
https://www.youtube.com/watch?v=Zka0i0SOGd8    

Graham 


-----Original Message-----
From:  rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org]  On Behalf Of The Rhodes 22 
Email
List
Sent: January-18-15 10:58  PM
To: The Rhodes 22 Email List
Subject: Re: [Rhodes22-list] How bad is  my CB plate?

Graham,  

Yes,  chop is the loose cut  fibers,  it also comes in a mat. 

The last book i read said that  modern construction methods for fiberglass
use a woven-mat-woven layup  pattern to gain the most strength. there was
discussion of some specialty  single direction fiberglass as well but that 
it
isn't used as much due to  cost of the materials. 

My father in law,  showed me a way to  pre-impregnate the glass,  stick it 
to
the repair site and then go  over it again with epoxy to smooth it out. 

I am waiting for some  slightly warmer weather to put my book learning to 
the
test. Should be  interesting to see if i can manage to not coat myself more
than the boat.  

James



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