I like your idea for this test.
I did it on prints coated with Polycrilyc.
Would be interesting to see if someone else can do the same with coatings of Timeless or Glamour
Hugo
Credit for the 'duct tape' test must go to Bill T, who described this method a few months back when myself and a few others were discussing the use of these aqueous varnishes to permanently fix the inkjet layer to the paper base by enmeshing them both in a layer of Timeless, rendering inkjet paper as permanent as uncoated watercolour paper while retaining its printing qualities.
He reported good results with Epson Watercolour and Breathing Colour Pura Smooth/Velvet papers, but poor results with Canson papers (although his mixture did not contain a surfactant). With a surfactant to enhance its wetting properties, I suspect Timeless (and other aqueous varnishes) would be able to sink into a wider range of matte papers, and perhaps even some glossy papers.