Lowe's.
I don't think I've used any pre mixed grout. Pre mixed mastik, yes. Spectra grout is now mixed so that you actually have time to use it all before it hardens. you need to get the bucket with the epoxy parts, and the color powder you want for the grout color. It isn't mildewing in the tub shower room, but the shower in the other bathroom which we did first, isn't holding up against mildew. Disappointing for all the work and cost. We learned early on that it was easier to apply it wearing latex gloves and squeezing it into the cracks.
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