Recommend a brush in grout for porcelain

[canalsiderenovation]

Some of the grout is coming out of our porcelain outside (likely from frequently hosing it because the training of the hens to stay off the patio isn't working wel, we even got a cat who is petriefied of said chickens)! The grout is a very dark grey.  I can recall a brush in grout being used but I can't remember which one.

 

Can anyone send me a link of a dark grey brush in grout please and if there is any way of keeping it once opened without it going hard?

 

Thanks

[canalsiderenovation]

Should I get something like this https://amzn.eu/d/cNvWTLc or https://shorturl.at/zeAQW or something else? 

[Mr Punter]

Once opened, store it with water on top to keep it from setting.

[canalsiderenovation]

39 minutes ago, Mr Punter said:

Once opened, store it with water on top to keep it from setting.

 

Mix it with water to store it? 

 

I am still unsure which is the best stuff to buy.

[Mr Punter]

Just pour some water on the top.  It stops the air getting to it and prevents it curing.  It will last 3 months.  I doesn't mix with the water.  I have just used Joint It Simple but there are lots of brands.

[canalsiderenovation]

Thanks 

 

Should I have a permable or non permable grout? I am presuming the brush in grout was permable?

 

The slabs were laid on compacted MOT  topped with a mortar bed of sand and cement. There is a fall on them and no drainage issues 

[canalsiderenovation]

Thanks 

 

Should I have a permable or non permable grout? I am presuming the brush in grout was permable?

 

The slabs were laid on compacted MOT  topped with a mortar bed of sand and cement. There is a fall on them and no drainage issues 

 

I have found the stuff we originally used it was https://www.tilingsuppliesdirect.co.uk/product/ultratile-propave-external-tile-grout?srsltid=AfmBOoqqWIztTfMWVL_E19WjgWZK8c2mKeKDwOqF5pSjqX0xMuMbyOvq