I've a 3/4 bag full of thinset that I'm not going to use. And I have mason's sand. And I've got to pour some footings for a small fence in my backyard. Can I mix the two and use instead of buying concrete?
I agree, but...
What you should do is chuck both bags in the garbage and buy fast curing
fence post setting concrete. Your own labour is worth considerably more
than the materials you use, and so it's foolish to compromize the
quality of your work by using inappropriate materials to save money.
You're only screwing yourself.
I agree to use the correct material. For $10 worth of concrete why risk
having to re-do the job later? But I disagree with tossing the thinset
in the garbage. Stop being wasteful. Someone can use it. Put it on
Freecycle, or sell it on Craigslist for a couple bucks, and apply that
money to buying the right stuff.
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