Variations in plaster appearance

cavey00

Member
May 6, 2019
10
Las Vegas
I'm currently draining a bit to replace some water and I've always wondered why my plaster looks like this. I know for a fact that it hasn't been redone in over 12 years. What causes this, and is there a fix for it?
 

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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
11,848
Northern NJ
Looks like worn etched plaster. Water chemistry may have had low CSI at times.

The fix is a replaster job sometime in the future.