Slate outdoor floor repair

[ssimmons]

Hello

We have slate on our outdoor terrace. It is covered.

However, it is wearing a little and some of the grout has coming out in parts plus some of the actual slate looks like it is wearing too potentially from water damage. I have no idea how long the slate has been there (newish home to us) but I think a long time. I have attached some photos.

We'd like to understand please:

• What is the best product to use to fill in the grout? What colour match do you think it is?
• How can we fix the actual slate that is damaged, if possible?
• What product do you recommend we use as a sealant over the whole floor to protect it from the weather? I am not sure if it has been sealed before.

Thank you