joerobson

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About joerobson

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  • Birthday 06/18/1950

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    http://www.violinvarnish.com
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    Trumansburg, NY

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  1. At least an hour after the odor is gone...for oil varnishing. Joe
  2. Looks like alcohol bubbling through the varnish. My guess is that it was in the sun. Perhaps moved from an air conditioned shop to outdoors in the sun. on we go, Joe
  3. Looking great Josh. Now just a touch of the widow's veil and a bit of polishing! on we go, Joe
  4. Next time we will work together more on dry brush polishing techniques.
  5. Vanishing is fun. If you are not having fun: STOP. Varnishing an instrument is a balancing act. All components must agree. There is the opinion of the maker. The opinion of the instrument. And, the choice of materials and application method. If one of them is incorrect then the task goes down the drain very fast. In Josh's situation I think the varnish mix was too viscous for the method and maker's hand. Also the coat was applied too thick. Changing the material in mid coat only added anxiety and the sense of being lost. Being lost and varnishing don't do well together. Taking a step back and getting the balance right let the fun return. After all the work, the varnishing is the reward. on we go, Joe
  6. Burn is the over absorbing of liquids or color into the grain. It causes unnaturally dark areas under the varnish. Concentrate your eye on the spot that concerns you. Move the instrument and observe. If the appearance of the spot remains the same from a variety of points of view, it is burnt. If the appearance of the area changes,it is not burnt. on we go, Joe
  7. joerobson

    Le Messie

    An interesting look at the maple texture of the Stradivari Messiah. on we go, Joe
  8. Balsam Ground + Aged Wood Color Gold. Aged wood color Gray Green added on the outline. Looking at these pictures I don't see the sparkle of real light...I know "get a better camera"..... on we go, Joe
  9. David, I have had the best results with resistance to sweat, perfume, etc. with my Pale Amber Varnish. The Dark Amber work almost as well, however the extra processing of the resin makes it a bit softer. Copal varnish works well, but is more common as a furniture varnish. If the amber varnish is breaking down as you describe, it is likely due to the varnish making procedure rather than the resin itself. Also a lot of the "amber varnish" made in Asia is not made from Baltic Amber. but usually from some domestic resin. Joe
  10. Don, Great post. Photo-degradation of wood has had a lot of study...particularly in the outdoor finishing trade. Early photo-degradation is primarily a minor breakdown of hemicellulose. As Jezzupe said, situation has everything to do with color. Backstory...my wife and I are renovating our kitchen. Our house is a poor man's Victorian built in 1890. The picture is of vertical grain fir bead board. The sample on the right is a cut off from the kitchen ceiling I just finished installing. On the left is the same material I cut from the basement stair way....a windowless corridor. So that material has been hanging unfinished, virtually in the dark, for the last 130 years. on we go, Joe
  11. There is no evidence according to Brandmair or Echard. The magic happens elsewhere. on we go, Joe