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Hello all! So, I've been really excited about trying to cook my first batch of oil varnish. I've been researching the forums on here/ various things on the internet and getting supplies for the job. I was planning on purchasing a hotplate for cooking the varnish on when I discovered a "dip coat melting pot" while cleaning out the basement of our shop. It looks like an industrial glue pot with temperature control ranging from 100 to 500 degrees F. Looking them up online shows me that they are designed specifically for heating viscous materials evenly (plastics, resins, ect.) and often come with "thermostatic control to eliminate carbonization". Seems like its the sort of thing that would be perfect for cooking varnish! Has anyone done or heard of others using these things, or just have opinions on the matter? Also, any more varnish tips/ suggestions would be well appreciated. -Marcus
Hello all. So I've been reading up on as much information as I can within reason about the use of nitric acid in the cooking of varnish to produce color. Of course, reading about it has made me aware of the potential problems in using varnish produced with nitric acid. Some people claim to have success and others have many complaints from color shifts to drying problems to cracking and all sorts of fun stuff. Putting all of this aside, I have three main questions, both highly related. Does anyone know what quality of nitric acid produces the production of the colorant? Is it the oxidizing quality or the strength of the acid itself? Could the unnatural oxidation be what interferes with the drying time? Also, has anyone tried to achieve similar results with the use of chemical products other than nitric acid?