Dave&Olive Posted August 13, 2009 Share Posted August 13, 2009 hi ok I want to paint the inside of an old barn with a hot lime mix i.e. slake some lime and paint it on when still hot ,back in the U.K. we used to use an old WW 2 stirrup hand pump , I have tried it will a paint brush but it takes an age , anyone got a sugestion what to use buy over here .. ?? Dave Link to comment Share on other sites More sharing options...
Théière Posted August 13, 2009 Share Posted August 13, 2009 Damn good protective suit and mask would be first on my list. Link to comment Share on other sites More sharing options...
Alex H Posted August 13, 2009 Share Posted August 13, 2009 DaveWhy do you want to do that? Is there some secret advantage in hot application? [8-)] Link to comment Share on other sites More sharing options...
Chancer Posted August 14, 2009 Share Posted August 14, 2009 Une crepinette. Link to comment Share on other sites More sharing options...
Théière Posted August 14, 2009 Share Posted August 14, 2009 That was my first thought J.R. but with the amount of caustic in the hot solution it may well eat it away and you will create a lot of nasty vapour that you wouldn't with a stirrup pump.All very intriguing, hope OP comes back soon, want to know more?????? Link to comment Share on other sites More sharing options...
andyh4 Posted August 14, 2009 Share Posted August 14, 2009 Is salked (EDIT or even slaked) lime any more caustic than wet cement? Not as hot I will grant you. Link to comment Share on other sites More sharing options...
Dave&Olive Posted August 14, 2009 Author Share Posted August 14, 2009 [quote user="Tandem_Pilot"]DaveWhy do you want to do that? Is there some secret advantage in hot application? [8-)][/quote] hi ok in a nutshell yes ... you can cover the wall in one coat, not several if you was using a cold lime wash from say lime putty . It`s white when it goes on not clear , the chemical process bonds the lime to the stone and it will disinfect the wall from any nasties, as used by farmers in the UK to paint their cow sheds ( shippens ) when I was a lad Daveps it`s for the new chicken coop that used to be a pig sty Link to comment Share on other sites More sharing options...
Théière Posted August 14, 2009 Share Posted August 14, 2009 [quote user="andyh4"]Is salked (EDIT or even slaked) lime any more caustic than wet cement? Not as hot I will grant you.[/quote]Ever heard of a body being disolved in wet cement? Link to comment Share on other sites More sharing options...
andyh4 Posted August 17, 2009 Share Posted August 17, 2009 That's quick lime not slaked lime - ie unslaked lime.There is no doubt calcium oxide (quick) is far more aggressive than calcium hydroxide (slaked). Link to comment Share on other sites More sharing options...
Théière Posted August 17, 2009 Share Posted August 17, 2009 yeh but no but yeh but......If it is still hot, the reaction is still going on therefore quicklime will still be present. After the converstion and the cooling slaked lime will be (should be) all that remainsFrom my understanding of the process.[geek] Link to comment Share on other sites More sharing options...
andyh4 Posted August 17, 2009 Share Posted August 17, 2009 If it is hot, it is usually because the heat of reaction has not been able to disipate. Any reaction that creates so much heat (exothermic) is usually fairly instantaneous, heat disipation however is not, so the mix heats up - and stays hot even though reaction is complete.Think of it like a kettle. It heats up, it boils, the thermostat switches the kettle off, but the water is still hot. Link to comment Share on other sites More sharing options...
Théière Posted August 17, 2009 Share Posted August 17, 2009 "If it is hot!"when did you last slake some lime? the whole vat is boiling if your not careful. It is not an instant, it is a conversion process over time.http://www.stancoprojects.com/documents/Factors_affect._lime_slakingR1.pdfA kettle is an endothermic reaction, the complete opposite. Link to comment Share on other sites More sharing options...
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