My shower pan has small dips like these (1 in each corner and 1 in the middle of each edge, so total 8) and the contractor didn’t caulk those. I asked on Reddit and 70% of people said to caulk over them and 30% said do not caulk over them. What are those and should I caulk over them?
Drain holes should be left open.
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What he said 
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Roger that!