You don't want any ridge you can feel or catch with your drywall knife. Once you think it's ready for paint, apply your primer and pay attention to how it looks while wet. The shiny wet paint will highlight any areas that need more work.
Hi mark. I was sanding down my lift off from my second coat and sanded too much and went down to my first coat and I can see the difference between the coats. I'm guess it's because the mud consistency was different between coats. So now when I sand the ridge/edge just keeps getting bigger.
Second, sanding should only be needed, if at all, after all the mud is applied.
My guess is you started with too much mud and now it is the high point that you keep sanding. Place a long straight 2x4 or 6' lever across that ceiling area and it will show the low areas that need the mud to bring everything up to being close to flat.
Well, you can control the dust by eliminating 98% of the sanding.
I read their instructions to add water one cup at a time and I'm not sure that is good advice, although I have never used that specific product. Regular 5 gallon pales of USG green or blue lid would take added water by the tablespoon. In my experience, not a pro, it's very easy to get too thin. Not sure if that is related to your "shiny" problem.
Do the long straight edge test and I suspect you will need to feather that spot out considerably to both sides.
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