I have a "roof deck" above my condo. It's a flat surface that doubles as the roof of the living area below.
I noticed an approximately 2-inch diameter bubble had formed on the surface and decided to try to fix it.
I was easily able to cut the bubble and expected to find a piece of dry rotted plywood, but the material appears to be some sort of cement board. See example below.
The hole is approximately an 1/8 inch deep.
What is the proper way to repair such a hole? Obviously the repair needs to be waterproof.
A guy at homedepot suggested something like Behr DeckOver but reviews on this online seem pretty mixed. Also, I'm not sure if that's an appropriate material for a patch job like this.
Using Bondo All-Purpose Putty as suggested