What is that material called between the coping and the pool deck

[jprimo]

From what it appears there is grout between each coping piece, but there is something else that appears to be a rubber/elastic material that goes in the expansion join between the coping and the concrete pool deck. What is this called and can I get my grubby little DIY hands on some in a retail store?

 

[737mech]

I believe you are referring to Deck o seal.

http://www.amazon.com/gp/aw/d/B004BV35CE?pc_redir=1405491157&robot_redir=1

 

[jprimo]

That looks like what I need - thanks!

 

[mas985]

It is call pool mastic. Deck-O-Seal is a brand of mastic.

 

[rmturner54]

Also called an expansion joint sealer