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Originally Posted by Karine Monaco
. . . Has anyone tried modern binders that would not cause any problem of slacking? . . . a big canvas . . . started to slack when I was working on it . . . product named RSG . . . was not true RSG . . . Karine
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Ah, Karine, we are cross-posting!
Some clarification. "RSG" stands for Rabbit Skin Glue. Yes, sometimes glues are identified as "RSG" and contain hide glues from other sources.
Possible confusion with "PVA" or Poly-Vinyl Acetate, a water-soluble synthetic glue, common brands are "Elmer's" and "Tite-bond". Some folks use it rather than natural hide glue.
In my experience, acrylic primed fabrics will "slack off" when worked on vigorously or otherwise manipulated. Cotton will tend to stretch with work, regardless of the method of preparation, and linen is particularly prone to changes in tension with changes in ambient humidity. Linen is deceptive to prepare because it shrinks so readily when washed, or in the first sizing. The "deception" is that it will draw up drum-tight regardless whether it is evenly tensioned on the chassis. Hemp is the least forgiving of sloppy or irregular stretching, although all stretched canvases will show the defects of initial preparation with age.