Hello
I need advice on what to do with a basement wall (concrete block) that I have sanded clean, applied Weber's red primer, and put a layer of plaster on. The problem is that the joints appear as darker areas on the wall. See attached image (the plaster looks red, but that's due to the lighting). Could the problem be that the red primer was very thin? The package states that it should be mixed with 6 liters of water (making it very thin). But on Weber's website, it says 4-5 liters. I've never had problems with it "showing through" before, but back then, I mixed it more by feel (and used a thicker mixture). Do you think it will be an issue with the finished wall after painting, will it be noticeable? The plan is to apply another layer of plaster and then paint with silicate paint (white or at least some light color). The plastering on the wall has dried for a week.
Is it just a matter of tearing it down and starting over? Or can I apply a layer of red primer on top of the plaster you see in the picture (so the wall becomes: concrete block - red primer - plaster - red primer - plaster)? How would you have done it?
It seems there is an issue with the image. I can see it when I am logged in. But otherwise, I get a message that says "You have entered an invalid attachment. If you followed a valid link, please contact the administrator." Is the image too large? I didn't see any rules about how large the image can be?
Is the exterior fixed? When?
Often, joints and stones have different absorbency, which can cause the plaster to appear slightly different. The red primer is supposed to counteract this, but if the difference is too great, it usually doesn't help 100%.
I would have applied the final layer of plaster and let it dry properly, and it will probably turn out well then.
