Our gunite pool is around 10 years old and the previous years winter was bitter and I believe caused some plaster to delam in small areas. I can tap to hear the hollow vs solid spots and it appears to be very localized. While I'm comfortable doing basic masonary repairs , like replacing coping etc.. I'm unsure what product to use to repair such an area. I see something called E-Z Patch , but it appears to only come in white. That would stand out like a soar thumb against out blue plaster. Any advice or materials , techniques ? Thx !!!