Hole too big for yard? Very worried

So we finally decided to with with a salt water system. We currently have for the coping luders and combination of luders and Oklahoma Stone for the back wall of the pool. My main concern is the coping. What kind of sealer do you recommend? Also, should we apply the sealer now, before they apply the plaster to the pool?

Just an update, the luders are scraping off. Has anyone have the same issue? What kind of sealer do you use?
 
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