Polymeric Sand as flagstone joint filler

It is critical that you get it off the stones before wetting with a broom and leaf blower, or you will have hazing.

Some people love it, I wouldn’t use it.

Edited to add to read instructions thoroughly in regard to spacing requirements… so many butt pavers and try to use poly sand.

I've had it used professionally on antique brick, flagstone and gray pavers. The bricks lost a lot of color due to a haze that's taken 2 years of scrubbing to remove. The brand was "haze free". The rubbery joint fillings on flagstone washed up and out with a year. The pavers went down in Feb this year and look good so far. So, results vary. It seems best if there is a good color match and an initial tight joint.

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I would use DG. You can get DG in the buff color and in a cold gray. I've seen DG is green, pink, dark brown and gold but its tough to find.

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I think this is the route I’m going to go. I can handle patching DG. I’ve done a lot of big projects and not a whole lot concerns me with anything more than getting walking surfaces right. The only thing I’ve ever screwed up beyond my ability to repair has been concrete. We poured a 400 sq ft pad and it turned out terrible. I don’t like solutions where the fix for a mistake is more work than the initial work.

If the flagstones are tight/minimal gap in joints, I would just use paver sand. If larger gaps, I would go with pea gravel.

We had it put between some travertine stones in our backyard and after the first rain half of it washed away.

How does the sand morph?

OP, look up a product called WetLok. It’s a type of Poly Sand that you can apply wet. That’s what I have switched to using on most of our Hardscape projects.

What was our poly sand supposed to do?

Turn into a mortar type of product?

The guy was using a broom to push it in between the tiles.

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I used decomposed granite. Lasts a long time and looks good

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I've decided this is what I'm going to use. I'm about to go pick up a half a yard of it. I don't think it'll even use that much. It took 1.75 yards of sand to lay a solid 2.5" base in it. I'm guessing a half yard load will fill it in nicely. I'll get pictures of it when I'm done. I do appreciate all of the responses.

Here is the pseudo finished product. I'm going to sweep over it again another time or two with more Decomposed Granite.

Looks nice, good match with your flagstone, I love flagstone

Also, the extra will come in handy for touch ups.