Usually metals are acid sensitive, so with that respect the zinc should be fine. However, zinc is a catalyst for certain organic reactions. Since your are performing an organic reactions (transesterfication) you may induce other reactions that you don't want. Also you may not be able to get the galvanization as clean as you want. For lab settings glass is used for its nonreactiveness. For an industrial scale stainless would probably be better or a dedicated plastic container designed for the purpose. The second problem with galanization is it is just a surface treatment. The zinc 'rusts' and in doing so sets up an electric current that prevents the underlying iron from corroding (cathodic protection). The iron is protected only until there is no zinc left. Heating and cooling could accelerate this process and destroy the barrel. Stainless steel uses cathodic protection as well but the chromium is fully interspersed, not just a surface plating. Finally, you should be careful about where you get your information, may of the sites do not correctly describe the process (you never actually form methoxide by mixing lye and methonal) and the technique for titration are usually not very accurate. These might not seem like big deals but lye can be just as dangerous as battery acid and not fully understanding what you are doing could lead to a dangerous situation.
PS warming the oil won't dry it unless you get above the boiling point of water, and think of what happens when you bacon in a hot pan of grease........(a funnel separator would be better to get most of the water out)
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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