ᐅ Is it necessary to vacuum the screed after priming?

Hello everyone,
Maybe a silly question, but we have freshly treated our cement screed with a primer.
Now I have noticed that after priming there are still some fine "sand" particles on the surface, just individual grains.
The question is, is it allowed or possible to vacuum again after priming, or would that rather damage the primed surface?

Unfortunately, I couldn’t find anything about this on Google.

The first coat of paint is scheduled for a few hours from now.

Best regards

Naturally absorb!

Thank you!

We vacuumed and then applied the first coat of paint.
We used relatively little paint for the first coat, even less than the manufacturer’s recommendation. However, after the first coat, the pattern of the screed is still visible.
I think we will apply the second coat a bit thicker than the first one (hoping it will adhere well).

I have one more question:
As mentioned, we applied the paint very thinly, but we immediately noticed that there are fine "fibers" about 1–3 cm (0.4–1.2 inches) long sticking out across the entire screed surface.
You can easily pull them out, but that would probably never end.
Do you think if I apply the second coat a bit thicker, these fibers could be sealed into the coating? I wasn’t able to find any information about this online.

You have fiber reinforcement in the screed. You should lightly sand it. Vacuum, then apply a thicker coat again. You don’t need to refresh the primer. It is called that because it penetrates deeper. You won’t reach that depth anyway. K.

Ok, thanks.

It’s best to sand by hand with a fine grit (e.g., P120-P240) or would it be better with a coarse grit (e.g., P40-P80)? Use light pressure since the goal is simply to remove the raised fibers.

I think an orbital sander or delta sander would remove too much material, right?

No. Take a sanding block and use a finer grit, around 120 or even finer, and then just lightly go over the surface. Only to remove the fibers.