Need help finishing a concrete hearth via /r/DIY

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Need help finishing a concrete hearth

I’ve made a new concrete hearth and was quite happy with the smoothness/colour of it (the front airholes will be covered by wooden trim) however whenever I touched the surface with my hand or a brush, a lot of particles came loose (is this “dusting”?).

I decided I needed to seal the concrete and used bostik concrete sealer. After 24 hours it now looks really patchy, still feels grainy to touch and I have no idea what to do next to give it a smooth clean finish?

Images below to show context and desired finish

https://imgur.com/gallery/wvZt2jq

Submitted June 11, 2021 at 06:21AM by juniorhood
via reddit https://ift.tt/35ov5pr

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