Filling holes in concrete countertop tips

[Andreascanr]

Hello!

Not sure if this question is in the right place, but I'll try. Maybe a moderator can move it to the right place otherwise.

We are soon going to move into an apartment that has a kitchen countertop made of a very rough gray-brown concrete. The countertop has a number of quite large pits (think bubbles/irregularities from the casting).
For hygienic reasons, I would like to fill in those pits in some way.

I have a few questions that someone knowledgeable can hopefully provide some tips on.

1. Do you think I can use regular wall filler or does it require a special type?
2. Can you buy colored filler according to a specific shade or can you color it yourself?
3. Any tips on how to clean the pits/irregularities to get the filler to adhere?
4. Other things I should keep in mind?

 

[leby]

You can't use ordinary filler. I would try with pure portland cement mixed with water to a suitable filler consistency. There is, of course, repair "massa" for concrete, but I don't think it adds anything.

 

[newbee]

I have cast a countertop for an outdoor kitchen, and it also had some pits. I used the same mortar that was used for the casting and brushed it into the pits and dampened the surface. Once everything had cured, I sanded the countertop with wet sandpaper. The result was a smooth countertop without pits, but it became a bit darker in the areas where the pits had been. At the same time, I think it looks nicer with the variations in color. Today, I probably would have used Ardex a31, as it likely would have been easier.

Another question is whether the countertop is treated in any way. That could certainly affect how well something adheres.

 

[Sebastian Goncalves]

Hello!

Not sure if this question is in the right place but I'll give it a try. A moderator might move it if necessary.

We will soon be moving into an apartment that has a kitchen countertop made of very rough gray-brown concrete. The countertop has a number of quite large pits (think bubbles/irregularities from casting).
For hygiene reasons, I would like to fill those pits in some way.

I have a few questions that I'm sure someone knowledgeable can provide tips on.

1. Do you think I can use regular wall filler or do I need a special type?
2. Can you buy colored filler in a specific shade, or can you color it yourself?
3. Any tips on how to clean the pits/irregularities to get the filler to adhere.
4. Other things I should consider?

I work with concrete and have cast three countertops myself at home and use cement for the pores in the countertop and treat with Lithurin and a sealing.