Peeling is caused by one of a few things. 


Surface is not clean. It is very easy to miss few spots when cleaning especially with pools and ponds this usually happens around the top edge of the pool or pond.
Solution: Remove all loose material, clean with a generous does of acetone and reapply coating.


First coat was not entirely dry when the second was applied. The coating is water and air tight so if you apply before it is dry, it may not get good adhesion.

Solution: Before you apply second coat do a quick adhesion test using duct tape. Press the duct tape tight to the         coating and rip it off.  Remove all loose material, clean with a generous does of acetone and reapply coating. 


There is a sealer in or on the concrete that is preventing it from sticking. This could come off in spots or the entire surface depending on how the concrete was previously sealed. 

 Solution:  Remove all loose material,You will need to grind off the sealer.  clean with a generous does of acetone and  reapply coating. 


Also Moisture in the concrete can cause adhesion issues. This you will be able to tell by the stretching  of the coating this is caused by the sun heating the concrete the the mosture turning to a vapor you get a bubble  when the concrete cools the bubble gos down and it repeats until the coating rips and water get behind the coating and starts peeling it a way.  

 Solution:  Remove all loose material,  clean with a generous does of acetone do a moisture test.  reapply. 

A simple test take an 18-inch by 18-inch clear plastic sheet and put it over the concrete and seal it on all four sides. After 16 hours, if any moisture or darkening of the concrete surface is found, the concrete is too wet for coating. Make sure the sheet does not come in contact with direct sunlight.
 


This is an example of water trapped in the concrete. The sun hits the area with water behind the coating it turns to steam and makes a bubble. This one has been expanding and contracting over time and eventually tore open. It is same principle as waterproofing a basement from the inside and water is coming in under pressure you get a bubble.


This is an example of sealer in the concrete. The concrete had a sealer added in the concrete mix. This the primer and everything came up. The solution was to sand the concrete to rough it up clean it and reapply. If you do not know the history of the concrete do a sample test spot using the duck tape test. You do not need to wait for our product you can test with any quality primer.