The ornamental sealer is made for “1/2 Price Pottery”… I believe it to be very similar to (and perhaps even the same product), as the “SealWall” products which were made in Belmont from the late 40’s up until now?.. It is water based and sets similar to wood glue…. I actually lived nearby as a kid and we would get it to use for school glues. Acetone does nothing on test piece.
268500cookie-checkWater based Pot Sealant on Carpet
Isn’t the Sealwall product just a PVA based product? Bondcrete, Cemstik, Aquadhere, Bondcryl (acrylic version?), some of these will just re-emulsify soaked in water, won’t they? l like PVA wood glue.
Try soaking the area with an acetone soaked rag for half an hour. If that still doesn’t work, go to the paint stripper section in Bunnings, and look on the labels for something with chlorinated solvents (typically chloroform or dichloromethane)