Well I found two condidates, of which the second sounds most like what was in the demo - now all I need to do is find some lol
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Pellon Sol-U-Web Pellon Sol-U-Web is the sewing aid that washes away! A stabilizer and temporary adhesive in one! Great for applique, embroidery on terry cloth and napped fabrics, lingerie, etc. Use as a stabilizer for machine embroidery, or as a temporary adhesive to position ribbon, lace and appliques. prevents stitches from sinking into pile fabrics and appliques will be softer than those permanently fused. Designed for machine stitching and will not gum up needles.
available in white: a.. Size: 9" x 54"
Vilene Sol-U-Web Premium Quality Stabilizer Vilen Sol-U-Web is a water-soluble stabilizer and temporary adhesive for machine applique, embroidery and monogramming.Sol-U-Web prevents stitches from sinking into pile fabrics, is designed for machine stitching and will not gum up needles. Use as a temporary adhesive to postition ribbon, lace and appliques.
available in white: a.. Size: 12" x 6 yards (30cm x 5.4 m)
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So now the question is -
Has anyone seen any Sol-U-Web anywhere? I have sent a query to our "local" Pellon rep to see if it is still on the market.