Recommended epoxy to fill a crack

[adamt]

I'll be working on fixing a long hairline crack in my pool this weekend. Just wondering what type/brand of epoxy I should be getting to fill the crack with.

Any advice is appreciated.

 

[pooldv]

My PB uses pool putty, it comes in black and white. He mixes them together to get a gray that sorta matches my blackish pebblesheen. Inyo Pools sells it.