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  #1  
Old 06-27-2008
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Liquid Nails

Hey everyone,

I am going to be doing some repair work to the soft cockpit sole of my new to me Laser II. I will be using the drill and fill technique that is discussed a lot here. My question is, can I use something like a "Liquid Nails" adhesive to rebond the soft sole together instead of an epoxy filler? Any thoughts?

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Curtis
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Old 06-27-2008
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Using Liquid Nails, which is a polyurethane-based adhesive is a bad idea. It really isn't designed for this purpose.

If the area in question is more than ONE SQUARE FOOT in size, you need to really re-core the area in order to restore the strength and function to the area.
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Sailingdog,

That is what my initial thought was, but I'm not really sure why I felt that way. Any specifics of why a polyurethane-based adhesive is a bad idea?

Thanks,
Curtis
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I used Liquid Nails to stick 2 inch foam board to a wall in a building. It doesn't work that great use putty epoxy if you don't want to use epoxy.
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The mechanical properties of the adhesive aren't really the same as epoxy. Epoxy tends to dry to a very hard solid form. Most of the polyurethane adhesives tend to stay fairly elastic and flexible. You're trying to stiffen the cockpit sole, and a flexible adhesive isn't really going to do it.

BTW, Liquid Nails tends to foam a bit and take up space, but the material really isn't all that strong if it isn't in direct contact with a surface from my experience working on my sister-in-law's condo.

What you need to do is cut the laminate, dig out all of the bad core material, lay in new core material—either end-grain balsa, Airex or Divinylcell foam—bedding it in a thin layer of thickened epoxy to adhere it to the lower skin, and then glass over it, creating a new cored laminate to re-create what was there originally.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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