Pool coping all came out

[ajw22]

Mortar is better in coping stone joints.

Grout cannot withstand the weather as well as mortar.

 

[palmtreeguy]

Can you grout the joints? Even unsanded grout might be ok in a super thin joint.

I'm not sure. Here are some pictures to give a better idea.

The joints vary between 1/32"-1/16", with just a couple at 1-8". From what I've read grout will crack, hence I'm considering caulking them with either the same self-leveling polyurethane sealant as the expansion joint, or the regular polyurethane version that is also water immersible but less runny (which I will also use for caulking the coping/pool tile line around the pool). I haven't seen anybody use that for grouting that so I don't know if it's a bad idea, or even doable with joints that small.

I was also considering taping the bottom of the overhanging coping edge and fill with polysand, but I think this may be too small for polysand as well.

 

[palmtreeguy]

Mortar is better in coping stone joints.

Grout cannot withstand the weather as well as mortar.

Saw your answer after replying. My reserve with that is that I don't want the gray lines to ruin the look (unless I sprinkle sand on top to color match?). The sealant would be tan color so it would blend in well. I wonder if it could be resistant enough if I also sprinkle a little bit of sand at the top of the joints to protect the sealant from the sun?

 

[Bperry]

Saw your answer after replying. My reserve with that is that I don't want the gray lines to ruin the look (unless I sprinkle sand on top to color match?). The sealant would be tan color so it would blend in well. I wonder if it could be resistant enough if I also sprinkle a little bit of sand at the top of the joints to protect the sealant from the sun?

Sealant generally doesn’t work well in very thin spots. The mortar can be colored.

 

[JamesW]

Unsanded grout will probably be the best choice.

You can get a color match.

You can use the continuous tile cutting blade to cut the joints that are too thin.

 

[JamesW]

About This Product
Polyblend Plus has all of the great features of original Polyblend, plus some new value-added enhancements to improve performance, finished color, and color consistency.

It is an ANSI A118.6 polymer modified, cement-based non-sanded grout designed for highly glazed or polished tile, marble and natural stone that would be scratched by sanded grouts.

This durable, non-shrinking grout accommodates joints up to 1/8 in. (3 mm) and can be used for interior or exterior installations, including floors, countertops, walls, ceilings, showers, fountains and pools.

Highlights
Brighter, more vivid finished color
Easy to use - just mix with water
Polymer fortified for hard, durable, professional results
Use to fill joint widths up to 1/8 in.
Use for countertops, tub surrounds, showers, high traffic areas and submerged conditions
Sample colors shown may vary from actual grout; final installed shade can differ based on tile type, porosity, job site conditions and finishing techniques
Sample colors shown may vary from actual grout; final installed shade can differ based on tile type, porosity, job site conditions and finishing techniques
Visit the How to Grout Tile Project Guide for tips on completing your grout project.

Custom Building Products Polyblend Plus #122 Linen 1 lb. Unsanded Grout NSPG1221 - The Home Depot

Polyblend Plus has all of the great features of original Polyblend, plus some new value-added enhancements to improve performance, finished color, and color consistency. It is an ANSI A118.6 polymer modified,

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