[Public-list] Hot Epoxy in the bilge

[David Fisher]

Hi David, are you adding the epoxy to repair the area, or just to get a 
smooth surface?  If you aren't able to get in to grind out the existing 
cracks and crazing, my experience is that any epoxy added will end up 
cracking too.  Can you get into the area to get it properly cleaned up and 
keyed to take the new surface?  Access to this part of the boat really isn't 
an Alberg strong point.

Cheers,
David, Kalitsah 440.


>From: "Amy & David Swanson" <zira at bellsouth.net>
>Reply-To: Alberg 30 Public List -- open to all 
><public-list at lists.alberg30.org>
>To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
>Subject: Re: [Public-list] Hot Epoxy in the bilge
>Date: Tue, 16 Jan 2007 21:13:24 -0500
>
>Rod & others -
>
>The reason I asked about the epoxy is, like many of the older style boats,
>the bilge in my boat under the engine appears to have been some type of
>filler material covered in styrene resin.  This resin is cracked & broken 
>in
>several places.  I want to fill it to a reasonably flat/smooth surface, 
>that
>is why I was thinking of pouring epoxy in.  I will probably still do this
>for the broken areas, in small amounts, then brush a couple coats over the
>rest.  Thanks for the suggestions.
>
>David Swanson
>Strayaway Child #229
>----- Original Message -----
>From: "Rod Symmes" <harmony at aztec-net.com>
>To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
>Sent: Tuesday, January 16, 2007 7:08 PM
>Subject: [Public-list] Hot Epoxy in the bilge
>
>
> > Hi David;
> >    Here are my thoughts on your epoxy in the bilge questions.
> > Because I am sure you intend to spread the epoxy as a  thin coating over
> > the surface of the bilge, I don't believe heat will be an issue in the
> > bilge because the thin coating will have a large surface area to get rid
> > of the heat of reaction.
> > HOWEVER..........if you will be mixing up a quart or two of epoxy in a 
>pot
> > of some sort,  heat will become a very serious problem.  The surface 
>area
> > of the pot will not be large enough to get rid of the heat created by 
>the
> > chemical reaction.  What's more, the rising temperature will cause the
> > chemical reaction to speed up which will in turn create even higher
> > temperatures...........I think you can see where this is going.  You 
>will
> > very quickly have a pot of goop that is too hot to hold and will set up 
>so
> > fast you will not likely be able to spread it.  One technique to buy 
>more
> > time before setup of a large quantity of epoxy is to mix it in a pot but
> > as soon as you feel it is properly blended,  pour it out into a shallow
> > tray to give it a greater surface area.  Even so, I would prefer to make
> > several smaller batches.  Even if you manage to keep the mixture at 70 
>to
> > 80 degrees F., your pot life could be as short as 10 minutes - it 
>depends
> > which hardener you choose.
> >    My experience with just a few  fl.oz.'s in one of those single 
>serving
> > yoghurt containers ( my favourite mixing pot for a small quantity ) the
> > heat of my hand will speed up the reaction and in a couple of minutes it
> > will feel quite warm.
> >    Another tip - my instructor had a wall clock in his shop and he
> > insisted we stir the epoxy mix for 5 minutes "BY THE CLOCK" to ensure 
>that
> > it was properly blended.
> >    Sorry to be so long winded.   Good luck with your project.
> >
> > Cheers,    Rod
> >
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