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There's an infinity of varnish threads on the forum so naturally I'll start another one. Yesterday I tried making varnish. Thoughts, comments, suggestions anyone? I was basically following the procedure shown in this link, https://www.ruschil.com/blog/making-violin-varnish using 6 oz. of linseed oil and 6 oz. of pre cooked rosin. The cooking lasted about 2 hours but I was using a cheap electric hot plate and it was hard to maintain a steady temperature. I tried to maintain 350f At the end of the cook at a lower temp (100c) I added in 0.6 oz. of mastic. It never did pass the 'string test'. Did I not cook it hot enough or long enough? I brushed a little of it on a scrap of maple last night and this morning it seems to have sunk into the wood leaving only an oily film on the surface. That was last night so it has not had any UV exposure yet, it will get some sun today. In the attached photo, the right side is the varnish. For comparison with some previous experiments, the thin strip on the far left is a previous cold mix of oil / rosin / turpentine and the thin strip in the middle is rosin dissolved in alcohol. Notice how those two leave a shiny surface layer compared to the varnish I made yesterday. I think today I'm going to put some of it in a small babyfood jar and bring it up to a higher temp and see what effect that has on it. Any advise from you varnish experts would be welcomed!
