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Yes to your ditra trowel size.
It takes a lot of mud to fill those voids in the ditra. just mix up a batch and start at it if you have any extra when you want to take a break go ahead and fill up the voidz in a far corner you're not working at. Mix another batch and continue. or you can feel all the voids first but the problem is it's going to have a bunch of bumps on it and hard chunks that you need to clean up first.
Have some real good knee pads.
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Teddy
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