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Mathlete 08-15-2012 04:20 PM

Scrape Cracks, Compound, Sand, Paint. Question about the sanding step.
I have a ceiling that was skim coated about 10 years ago. It was skim coated b/c the paint was 20 years old and chipping EVERYWHERE. To repair/sand/feather it would have taken months. Instead, if was skim coated in 2 days. It's holding up decently, but there are a few cracks where shower moisture has reached.

So, I blasted out all cracks with a putty knife. I applied joint compound. I did not try to make a perfectly smooth finish since I knew I'd be sanding it either way. I waited about an hour and applied a 2nd coat of compound to make sure the entire patch was "raised" for sanding (and not below the plane of the rest of ceiling) and to fill in some air holes.

The next day, I sanded with 200 grit on a sanding block. Pretty close. I then feathered some spots with some sandpaper around my finger. I think it's ready for painting (2 coats)

1) Does it seem like I am doing this the right way?

2) I just read the joint compound directions on the can.
It said not to dry sand but to "sand" using a damp sponge!
Much less dust. Is this what most people do?

Brushjockey 08-15-2012 04:26 PM

Personally, no. I don't think a sponge feathers good at all and because it is soft it will leave a hump.
I use ( depending on mud, there are many types/hardnesses) a hand sander with 100- 150 grit. But if you have a quantity to do , there are ones that can attach to a vac to suck up the dust as it goes.
Marshalltown makes the best one i know of, and is best to find online.
Other than that- just lay drops and be ready for a little dust to clean up.

Mathlete 08-15-2012 04:29 PM


Originally Posted by Brushjockey (Post 989579)
Other than that- just lay drops and be ready for a little dust to clean up.

Thanks, I will stick to 150 grit, but what do you mean by "laying drops"?

Brushjockey 08-15-2012 04:35 PM

Dropcloths- cover what you dont want covered with dust.

Mathlete 08-15-2012 04:37 PM

Just wondering, what about wetsanding with that black waterproof sandpaper (like you'd use on plastic headlights)
Do people ever do that?

Brushjockey 08-15-2012 04:50 PM

If it is premixed- I think it rewets too easy- if it was setting mud ( powdered- hardens chemically ,not by evaporation) and the abrasive was on a handsander so it didn't ride up and over ( hump) maybe.
But if your just doing a small area, and not finishing with anything glossy it might not be a problem.
Make sure to spot prime after you are done ( or hit it with the paint to prime if acrylic)

Mathlete 08-15-2012 04:54 PM

What will the primer do?
Help fill/mask imperfections?

Jay 78 08-15-2012 05:01 PM

You absolutely have to prime over the areas where you used the compound. Attempting to paint directly over those areas is going to pick up and drag/dust, and the paint will suck right into the compound and 'flash'. You need to seal it with primer before painting.

Mathlete 08-15-2012 05:03 PM

Got it. Thanks!

chrisn 08-16-2012 05:03 AM


Originally Posted by Mathlete (Post 989601)
What will the primer do?
Help fill/mask imperfections?

give the paint something to stick too

Mathlete 08-16-2012 04:38 PM

I painted the dozen or so repairs in made on my ceiling.
However, the new paint seems like a different color.

However, when I used the ORIGINAL can of leftover Eggshell paint,
it seems whiter than the ceiling. Is this b/c it's not cured yet?

How long until it starts to look like the original existing eggshell paint?

Unless I used the wrong paint, but I am almost positive this is how it was done originally:
Light Grey on the walls
Semi gloss in kitchen/bath/trim.
Eggshell white on ceiling.

Brushjockey 08-16-2012 04:47 PM

..did you prime the spots first?

Mathlete 08-16-2012 04:48 PM

Yes, primed well.

chrisn 08-17-2012 03:14 AM

Again, are you using the term "eggshell" as a color or a sheen?

Mathlete 08-17-2012 07:52 AM

Benjamin Moore
Eggshell Aquavelvet
Super White 319 02

It's the next day, and the paint does not match.
The old original ceiling looks grey/white.
But, the touch ups looks like cream/beige

Either the ceiling faded big time,
or the paint can got "stale" and turned beige,
or I did not mix the old paint can enough.

I will go buy a new can of "Super White 319 02"
and try touching up with a new (fully mixed can)
and see how it compared.

Does this seem like the right plan?

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