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WRT mixing things, do you reckon I’d need a cement mixer for the cement/sand mix under a resin shower tray, or is it doable in a (large) bucket?
Tray is 1500 x 900 x 37.
I managed with a bucket and drill mixer for tile adhesive over a slightly larger area but obviously the layer is a lot thinner than this needs.
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It's usually the kind of thing you can knock up on a spare piece of plywood or if you are really well prepared one of those plastic trays with surrounding lip (like a shower tray!) that you mix it on with a shovel. I don't find a bucket all that useful with sand and cement, the sand is a bit too dense to get it to mix that way.
Bit late to this but I hope it's worked out well. You can vary the drying time of the TX110 by changing the temperature of the water you mix it with. I've become very scientific about the amount of powder to water as well because it is so good a filler when it's the right consistency.