What product should I use to fill these concrete seams?

I am trying to prepare my floor to install some snap together vinyl tile. The final step is filling these cracks/joints and I cant decide which product is best to use. I want the end result to be flush and level with both sides.My first thought was self leveling sealant but I am worried that will be too soft. My other ideas are normal thinset or the product linked below.https://ift.tt/3u2TI5P via /r/DIY https://ift.tt/37lHKur

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