Treatment of cast concrete slab?

[Daniel Gernandt]

Hello

I have cast a countertop in concrete that has now been sitting for a week. It will be placed outdoors as part of an outdoor kitchen.

Two questions:

*I plan to round off the edges and sand the surface with sandpaper. What grit size should I use?

*What should I treat the concrete slab with to avoid too many grease stains etc.?

I want the slab to have a somewhat rustic feel, so it's not crucial for it to be perfect.

Grateful for tips!

Best regards,
Danne

 

[TypRätt]

Hello

I have cast a countertop in a finger ring mold that has now been sitting for a week. It will be outdoors as part of an outdoor kitchen.

Two questions:

*I plan to round off the edges and sand the surface with sandpaper. What grit size for sandpaper?

*What should I treat the concrete slab with to avoid too much grease stains etc.?

I want the slab to have a bit of a rustic feel, so it doesn't have to be perfect.

Grateful for tips!

Best regards
Danne

You can easily round off the edges with an angle grinder with a suitable disc, but why use sandpaper? The side that will be facing up should be the one that was facing down in the casting, and if you used, for example, plywood for casting molds, it should be as smooth as it can be?

 

[Daniel Gernandt]

You can easily round the edges with an angle grinder with a suitable disc, but why sandpaper? The side that will be facing up should be the one used in the casting, and if you've used something like plywood for molds, it should be as smooth as it can be, right?

Hello

That's true I haven't removed it from the form-plywood mold yet, so I don't know how smooth it has become.

What do you say about stain treatment then? Any tips there?

/Danne

 

[TypRätt]

From what I understand, you can treat it almost like wood, i.e., with oil or wax and probably some other things as well. I guess there is no "right" answer as it probably depends on whether you are going to place hot things directly on it, etc. I would guess that wax is the most common, but wait until someone with more experience can contribute with better control questions on how you want to be able to use it and how often you might consider doing maintenance work.

 

[MrJay]

What do you say about stain treatment then? Any tips there?

Seek and you shall find..
https://www.byggahus.se/forum/threads/behandling-av-betongskiva-till-utekoek.293320/

 

[Daniel Gernandt]

Seek and you shall find..
[link]

Hi. I'm planning to try this:
https://www.wsochcompany.se/ytbehan...och-sten/betonglack-for-inom-och-utomhusbruk/

And then with a topper on top:
https://www.wsochcompany.se/ytbehan...l-betong-och-sten/topper-for-betong-och-golv/

 

[billyby]

Just as you might have seen, I'm also into casting. I've done it once before and used steinfix 100. It turned out great, and even though I'm not the tidiest in the kitchen, I still managed to keep the surface nice for two years (then I moved).

 

[Daniel Gernandt]

Am just like you perhaps have seen also in the casting mode. I've done it once before and then I used steinfix 100. It turned out great and I, who am not the cleanest in the kitchen, still managed to keep the surface nice for two years (then I moved)

That sounds good. Nice to have just one product to treat with too. I'll try it

/Danne

 

[BosseHansson]

Clear lacquer for floors 2-comp is what I will use next time.

 

[Daniel Gernandt]

Clearcoat for floors 2-comp is what I will use next time.

Any experience with it before?

/Danne

 

[BosseHansson]

Any experience with it previously?

/Danne

Only painted a floor with it. But it feels like it becomes hard and easy to clean. I would choose one that is diffusion-open.

 

[billyby]

The advantage of steinfix is that the concrete maintains the same appearance. But if, for example, you want a different finish, then clear varnish is probably a good alternative.

 

[BosseHansson]

The advantage of steinfix is that the concrete retains the same appearance. But if you want, for example, a different finish, then clear varnish is probably a good alternative

"The product gives a slightly shinier and darker surface, which highlights the stone's structure."

It says so on the website and I have also experienced this with other similar products.

 

[billyby]

Maybe you mean another steinfix than 100?

https://www.steinfix.se/produkter/steinfix-100/

 

[Daniel Gernandt]

Hi. Some other things have come up, but the concrete slab is now cast and out of its mold. I was thinking that I want to sand down the top surface of the slab. Should I do it with water and wet sandpaper (like 600) or dry cross with wet sandpaper, will the water cause stains?

Danne