I made a 16" square patch to a flat 1/2 sheetrock ceiling, and my boss gave me premixed all purpose to finish it with, as well as mesh tape. The JC looked like rubber, and when I tried to spread it out, there were clumps and I couldn't get a smooth finish. I am a beginner as well, so I'm seeking advice about how to work this stuff and how to finish smoothly in general.
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How to work w/ premixed compound?