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Updated: May 9, 2025
Without plunging into the whirlpool of the best or particular gums, resins and their individual mode of application, a matter that will take up hereafter our more undivided attention, it may be taken as a certainty that the varnishing materials used for the parts under consideration must be of an alcoholic solution, no other would "set," evaporate or dry with sufficient rapidity to allow of handling: or, as we may put it in another way, that would lose tackiness within a convenient time.
For softening purposes a very small quantity of gum thrus may be used, too much will result in tackiness. For hardening, sandarac has its place and usefulness, although, as with the naturally soft gums and resins which return to their original condition after the solvent has evaporated, great care must be taken to use a very small proportion.
As you advance step by step, and before you venture on another layer, with the tip of your finger test the varnish, and if there be the least tackiness, wait a day or two until all be dry.
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