Hello,
I would like to paint on some plasterboard walls which have already been previously painted on. However, the surface feels slightly rough and has widespread pigment. Probably this type of surface is seen as normal by most of people, but I really would like to achieve an absolutely smooth surface to improve brightness. After some research, I’ve reached to possible explanations:
a) the water in the previous paint was absorbed by the plasterboard, or
b) the wrong type of roller (e.g. long pile) was previously used.
Here a list of test I did until now:
1. I tired to paint over the existing paint and the wall become even rougher than before.
2. I tried sanding with 120 and 180 grits sheets. I get a smoother surface but I find loads of very small holes on the surface like if it was punctured (and I don't think that's caused by the sanding).
3. I tried to use some white paint diluted with 4 parts water and rolled on the existing paint but that didn’t seem to work. I did it again on the area that was sanded and still looks no good. This result made me think that the porous wall is not the issue here.
4. I tried using short pile Purdy rollers and Purdy brushes on the sanded area. Although I get a nicer finish with the brushes, I still can’t get rid of those small punctures.
I want to use a Dulux Matt paint called Light & Space which is particularly bright and easily show all imperfections. I’m thinking to try a Polycell product like Basecoat or Finishing Skim Polyfilla to make a very smooth surface over the existing one but I have no idea whether it would solve the problem or not.
Do you have any suggestions please?
Many Thanks!!!
I would like to paint on some plasterboard walls which have already been previously painted on. However, the surface feels slightly rough and has widespread pigment. Probably this type of surface is seen as normal by most of people, but I really would like to achieve an absolutely smooth surface to improve brightness. After some research, I’ve reached to possible explanations:
a) the water in the previous paint was absorbed by the plasterboard, or
b) the wrong type of roller (e.g. long pile) was previously used.
Here a list of test I did until now:
1. I tired to paint over the existing paint and the wall become even rougher than before.
2. I tried sanding with 120 and 180 grits sheets. I get a smoother surface but I find loads of very small holes on the surface like if it was punctured (and I don't think that's caused by the sanding).
3. I tried to use some white paint diluted with 4 parts water and rolled on the existing paint but that didn’t seem to work. I did it again on the area that was sanded and still looks no good. This result made me think that the porous wall is not the issue here.
4. I tried using short pile Purdy rollers and Purdy brushes on the sanded area. Although I get a nicer finish with the brushes, I still can’t get rid of those small punctures.
I want to use a Dulux Matt paint called Light & Space which is particularly bright and easily show all imperfections. I’m thinking to try a Polycell product like Basecoat or Finishing Skim Polyfilla to make a very smooth surface over the existing one but I have no idea whether it would solve the problem or not.
Do you have any suggestions please?
Many Thanks!!!
