Vintage Fountain Pen Rubber Sac adhesive or sealant-preferred by the pro's

Description

Vintage Fountain Pen Rubber Sac cement or sealant
100% amber shellac----NOTE---THIS ITEM MAY NOT BE SHIPPED TO SOME INTERNATIONAL LOCATIONS
I have used  this item for 40 years of pen repairs.I use a toothpick or small cheap artist brush to apply
enough to do several dozen pens.
Used to attach rubber sacs to nipple on sections and seal section to barrels
Visit my ebay store--4500 vintage pen related items--large selection of rubber sacs and gold plated nibs and limited selection of parts
Vintage ink pot stamped Lewis Glaser, Charlottesville, Virginia.  It looks like sterling, but I can't find a stamp to indicate this.
Dimensions: approximately 2 inches tall; 2 and 11/16ths inches wide