We live in an old house. The bathroom off our bedroom was once a small porch and the former owners made a small bathroom out of it. However, it has no air conditioning or heat. It's just built on a cement slab.
By metroplex from Houston, TX, USA
Since it's a room that receives a lot of moisture I would use the heavier, thick paste type of Spackle rather than the whipped fluffy kind you can use for picture holes and minor cracks. Even if you have to do two or three coats; do it that way (multiple coats) because globbing on a lot of the thick Spackle in one go doesn't work very well because that will crack upon complete drying. If you have to do more than one coat be sure to lightly sand between each coat.
I would use the webbed seam tape for wallboard as well on the cracks. This will help it from cracking again. Apply the webbed tape and use a putty knife to put the spackle ( I use wallboard paste) over the tape in a thin layer and let this layer dry. Then put another layer on covering any signs of the tape. Let dry completely and sand the area with sanding grid to make a smooth look. Prime with white flat paint then put your paint of choice on. It takes time to do this but the end results will look nice. My husband was a handyman and I was a handywoman and did all his wallboard repairs for him. If you have water stains use the shelac based Kilz.
You live in a humid climate, the problems will only continue. Figure out a way to vent that place before the problems multiply! Congrats on fixing up the place! Buy the best venting you can afford. We purchased a vent for our no-window bathroom and although the clerk told us we did not need a higher HP motor, he was so wrong!
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