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Old 08-27-2011, 11:17 PM   #1
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Advice required painting interior wall - Should I sand?


I am planning on painting an interior wall. Currently the room is painted with the very cheap builders paint. Itís pretty rough and feels a bit like primer. The plan is to use two coats of some nice latex paint. Do you recommend to pre-sand the walls to get a smooth finish? What grit do you recommend and should I sand between latex coats and of course what grit to use?

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Old 08-28-2011, 03:21 AM   #2
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Advice required painting interior wall - Should I sand?


Jsheridan gave better advice than I did, I canceled out my post.

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Old 08-28-2011, 07:16 AM   #3
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Advice required painting interior wall - Should I sand?


Dan, my recommendation would be to sand the walls using 80 weight paper, that's my go to for that purpose. Don't use too much elbow grease, but allow the paper to do the work. If it's a builder's flat, and you want a nice job, I would use a primer/sealer (underbody) as a first coat, then apply your two finish coats. Cheap builder grade paints are usually high clay based products, which suck up paint. Without a primer, the first coat of finish is generally not sufficient to properly seal the surface, which requires the second coat to finish the job. What that means is that you will not realize the full color or sheen of your finish paint after two coats. You could apply a third coat of finish if so, but it is far better to have a stable surface to apply your finish. As to sanding between coats, I always do, even it's only my standing reach height up and down. Reason is that no matter how hard you try, each coat of paint will leave some contaminents on the surface, dust, cover fuzz, stuff in the paint, bugs, whatever. If you sand between coats, you're only leaving one layer of contaminent, the final one, instead of two. This will give you a smoother final finish. Use 150 or 180 weight to sand between coats. Dust as usual. Have fun.
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Old 08-28-2011, 07:38 AM   #4
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Advice required painting interior wall - Should I sand?


Thanks for the great advice. Last question. If I go ahead and sand in the manner, which you are suggesting should I still wash the walls with a sponge and mild detergent, or should I just sand, clean the dust and start painting?
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Old 08-28-2011, 08:34 AM   #5
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Advice required painting interior wall - Should I sand?


I say no to washing, but some will say yes, so, it's your call. I just use a foxtail brush (the kind you use with a dust pan) and give the walls a thorough, vigorous brushing off. If you do decide to wash, skip the detergent unless it's a kitchen wall or otherwise gets dirt/grease. Detergent only increase the possiblity of leaving additional residue to interfere with adhesion. Plain water and a rag, rinsed often, will remove fine surface dust. Or, just use Ben Moore Fresh Start Primer #023, it'll seal the surface and bonds well to chalky surfaces, killing two birds with one stone. Work smarter. The higher price of a primer will be nothing compared to the labor cost of washing walls and the time waiting for them to dry to prime.
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