My husband recently installed drywall on the ceiling of our kitchen, he has taped, mudded and sanded at least 3 times but you can still see a line even after painting it white.
Do you have any fixes for it?
Drywall can be tricky and very revealing... Are you seeing the line from the mud or is it a crack? What size is he using to trowel, you may need to just feather it out further (seams at about 2', if you use too small of a knife you will see the hump, if you do have a hump you may have to apply a coat of mud to both sides.) Remember paint will show even more imperfections so make sure its perfect before you prime.
Changs are he started out with the mud to thick under the tape sometimes it is also cause by your joist like the other response said try making a wider past over them and blend it in the best you can you may have some small humps by the tape wont show and use a flat paint .
I would suggest that you texture the ceiling as it will hide any imperfections. You can also popcorn it by purchasing a spray gun for that purpose.
He left a gap between 2 pieces of drywall and tried taping them together and sanding etc. It wasnt just a normal drywall crack?
Any suggestions would be appreciated!
Ceiling taping is one of those jobs that takes time and art. The height of the ceiling makes a big difference in what diffect you will and will not see.
In order to not see the seam line in the joints feathering the compond out from the center about 10" to 12" doing this with proper sanding would prevent you from seeing the taping lines when painted.
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