etch after sanding?

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leaf's picture

Hi,  If this is a repeat, sorry.  I don't think my first effort to post worked.  

I just tightly-troweled down a microtopping and then sanded it with 100 grit sanding screen.  Do I still need to acid etch before applying acrylic sealer.  The reason I ask is because the sanding left scratches all over the floor (which I'm happy with because it made the color better).  The microtopping is Ardex SD-M.  Thanks for the help!

You, probably could have put

You, probably could have put acrylic on sdm without any sanding etc. maybe check with your local Ardex rep if your having issues with that but ya I think you could just roll an acrylic without additional prep.