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putting a strip of 4mm glass mosaic between 6mm tiles
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[QUOTE="John Wallace, post: 612531"] Thanks for the quick response, AliGage. As the glass tiles in the mosaic strip are only 20mm square, I think it is drying out OK, but I'll try an experiment with some scraps of mosaic on a scrap of aquapanel to confirm that. As you say, bagged adhesive uses hydration of the cement powder in it to form interlocking crystals that set it hard, so sets even if it hasn't dried. Chemistry isn't my best subject, though I did take it to A level, and covered the chemistry of cement during an engineering degree. The problem in this case is that I don't have any idea what is in White Star, and how it sets. Most adhesives go solid by some sort of polymerisation, where a short chain molecule assembles itself into longer chains. The polymerisation can be triggered by a catalyst, or by oxidation. Drying out of itself makes some things go solid (effectively the glue is in solution in water), but is usually reversible, so is unlikely to be used in a tile adhesive. I think water may be acting as an inhibitor in White Star, stopping the polymerisation, but that when polymerisation has made it set, it is not reversed by getting it wet again. Its very impressive how well it remains usable until the tub is almost empty - several times, I opened a near-empty tub, expecting to find it dry and solid, but it was still wet, smooth, and workable (yet the stuff would set on my fingers in minutes). [/QUOTE]
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putting a strip of 4mm glass mosaic between 6mm tiles
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