Chalk befor lead pour

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Chalk befor lead pour

Postby wmewheel on Fri Mar 25, 2016 12:09 pm

Getting ready to pour the lead into the keel.

I met a builder at the Wooden Boat Show in Mystic a couple years back who said he applied chalk to the wood prior to purring the lead to minimize burning.
I can't find a reference to this practice anywhere else.
Anyone know if this is a good practice?

Thanks,
Mark
wmewheel
 
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Re: Chalk befor lead pour

Postby ddemasie on Fri Mar 25, 2016 12:18 pm

I am not familiar with that practice at all, but I can say that I poured the hot lead straight into the keel compartments with just the exposed plywood and framing.

It smoked a little (which added to the fun of it all), but I had no problem with burning or anything. It becomes a totally encapsulated chamber once you add the keelson and epoxy it closed, so there are lasting visual effects at all of the heat when it is all done.

It cools incredibly fast.
Dennis DeMasie,
Aurora, IL
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Re: Chalk befor lead pour

Postby ddemasie on Fri Mar 25, 2016 12:29 pm

Oops - there are NO lasting visual effects I left out an important word in that sentence :/
Dennis DeMasie,
Aurora, IL
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Re: epoxy globs and lead pour

Postby wmewheel on Tue Mar 29, 2016 9:59 am

How do globs of thickened epoxy react to hot lead?
Not sure how I would even clean them out of the cavity at this point.
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Re: Chalk befor lead pour

Postby craig on Tue Mar 29, 2016 11:24 am

The epoxy will burn/char when exposed to the liquid lead. Don't worry about it. I don't know if chalk will reduce burning, but it certainly isn't necessary. Pour in confidence!
Titania, launched January 2015
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Re: Chalk befor lead pour

Postby wmewheel on Fri Apr 22, 2016 8:10 am

Ok
Poured the keel with no real issues.
In answer to my own questions.
1). Yes, chalking the wood does reduce burning. I left the front compartment alone and chalked the rear compartment.
There was noticeably less burning with the chalk around the top edge of the pour.
2) large epoxy globs are to be avoided . A few moments after the pour they started to gas out significantly, though thankfully not explosively.
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