There are a few "chips" in our concrete pool coping that we need to patch. When I got closer and touched it, underneath the concrete is a very squishy type of material. What is this? Is it normal and safe to use normal concrete sealers? Our coping got eaten up a bit when randomly, with our abnormally cold weather in SoCal, salt seemed to eat away and certain spots of the concrete. I've been washing it away as best I can but keeps reappearing. Really need to get this thing sealed!!
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