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Chalk befor lead pour
Posted:
Fri Mar 25, 2016 12:09 pmby wmewheel
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
Re: Chalk befor lead pour
Posted:
Fri Mar 25, 2016 12:18 pmby ddemasie
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.
Re: Chalk befor lead pour
Posted:
Fri Mar 25, 2016 12:29 pmby ddemasie
Oops - there are NO lasting visual effects I left out an important word in that sentence :/
Re: epoxy globs and lead pour
Posted:
Tue Mar 29, 2016 9:59 amby wmewheel
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.
Re: Chalk befor lead pour
Posted:
Tue Mar 29, 2016 11:24 amby craig
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!
Re: Chalk befor lead pour
Posted:
Fri Apr 22, 2016 8:10 amby wmewheel
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.