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joerobson

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About joerobson

  • Birthday 06/18/1950

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    Trumansburg, NY

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  1. I have applied for the NJ right to know MSDS
  2. My guess is shellac wax in a proprietary solvent. on we go Joe
  3. My experience is much the same. Too much oil in Frank's method. I like your methods. I just post this to clarify the difference between what we do on a violin to what the rest of the wood working world thinks of as French polishing. on we go, Joe
  4. The best discrimination of French polishing that I know of is in a book called the Adventures in Wood Finishing by George Frank.
  5. Brian Derber. Take Todd Goldenberg's workshop through UNH.
  6. Very interesting. I have not tried their products for years. I'm looking forward to your experiment. Pictures please. on we go, Joe
  7. To clarify. Brushing vs. Rubbing varnishes. The higher the oil content in relation to the resin the more likely the varnish will have its best appearance off the brush rather than as a result of being rubbed out. So we have a range of possible options. Varnish makers manuals, developed over more than a couple centuries, concur that rubbing varnishes have ratios of between 8 and 12 gallons per hundred pounds of resin. Linseed oil weights about 7.75 to 8 pounds per gallon. So a 1:1 ratio is at the upper end of those standards. The actual behavior of the varnish will vary somewhat given the type and processing of the oil and resin. The finish achieved is a combination of materials and the expertise of the varnisher. on we go, Joe
  8. Adding linseed oil or Linox to the existing varnish creates a workable mixture but does not alter the oil to resin ratio of the cooked varnish. You could add a longer oil varnish and they will "average" one another. High oil fossil resin varnishes do not polish as well as 1:1 varnishes do. on we go, Joe
  9. What copal were you fusing? In what quantity?
  10. It is true that It is true that the amber and copal varnishes are more durable than classic colophony/pine resin varnishes are. However the cooking process is more involved. First make sure of your materials. There are lots of copals available, but most are not (or only partially) soluble in oil. Second. The cook depends on temperature and duration. The material must be heated to high temperatures and allowed to cook until solubility is obtained. The process is called decarboluxatoin. Cooking in small batches is most often a recipe for failure as these factors are difficult to judge when the small amount comes to temperature. on we go, Joe
  11. I don't measure. I began...way back when...using information from varnish making texts. Then I adjusted for violin varnish. As I always use the same colophony and raw pine saps , I don't have to adjust. on we go, Joe
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