Outdoor Caulk

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Hi All,

Quick one, trying to fill in air holes in the concrete

as shown in pic. I’m just wondering what’s best for it. Caulk would be most workable but wouldn’t last.

Thanks.

Lumen

Some kind of cement based patch/finish compound, like...

http://www.parex.co.uk/General_Construction_-_RMI/Concrete_Repair/Vertical_Face/Skimcoat_Plus.aspx

Which you could presumably make yourself with cement and water, and possibly pigment if you want to match it. You don't want sand as it'll make the mixture too coarse to fill the pinholes. That wouldn't have the polymer in it though.

I guess it depends on whether you want to just fill the holes or coat the whole surface.

This is a common problem in concrete countertops, so that's something you can search for.

jack of all

You can get cement-based exterior fillers in any of the DIY/ decorating shops also and I've found them very good for small repairs/ holes in concrete and render. They seem to have a superfine agregate/ dust in addition to cement.