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Priming Anhydrite Screed
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[QUOTE="jesteh, post: 684819"] Thanks very much for all the answers. It sounds like gypsum adhesive is a better and lower risk option. If thats the case why on earth would anyone ever consider using cement adhesive on anhydrite - epoxy primer or not? Just an example of using epoxy primer - I spoke to the Tremco about priming anhydrite with their stuff. Their advice: 1. Mix and apply CS175 epoxy primer first (~£100 for a tub) 2. When that dries apply CS100 epoxy primer over that (thats another £100) 3. When that dries apply levelling compound over the whole lot (thats probably next £300). Apparently you can't just use adhesive straight, you must use levelling compound first! So thats £500 gone just to prepare floor for tiling. I am sure thats over-complicating to an extent but that is Tremco's advice on priming anhydrite. Laybond on the other hand offer far simpler advice: 1. Mix together Screedmaster resin and the hardener (~£70) in correct quantities. Water it down to right consistency and apply. 2. Wait a day and start tiling :). How can the two systems be so different yet achieve the same result? Either system though is not cheap, then you have to get the quantities right, mix it carefully, apply it carefully, try not to get any in your eyes on your skin and if you missed a spot your tiles will fail. Why would anyone take the hassle if there is perfectly adequate gypsum based adhesive that will do the job? It sounds like people still do it so there must be a genuine reasons for it. Finally a question for Ajax on priming for gypsum adhesive - I have been told by Creative Impressions (and others) that with their gypsum adhesive I must still prime the floor to create moisture barrier - in one of your other posts you also recommend priming to stop adhesive drying out too quickly. Are you saying in above that priming is actually not required? Finally, what would happen if I applied gypsum adhesive on epoxy primer? Best of both worlds, absolutely no advantage whatsoever or a complete disaster :yikes: [/QUOTE]
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