Chalk line Is the powder washable or removabe ?

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Old 10-20-15, 09:46 PM
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Chalk line Is the powder washable or removabe ?

I want to use a chalk string indoors to mark out locations of 2" x 4" studs in the ceiling. The ceiling is drywall and painted. Will the powder come off easily with a damp sponge or just using a damp cloth or is the powder permanent ?

Thanks

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Old 10-21-15, 03:45 AM
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Blue chalk with a permanence rating of 0 will wash off, but most others will not. It's almost never a good idea to chalk something that will be painted. Chalk is a pigment, similar to the dry pigments used to make the liquid paint base colors. So chalk will usually tint your paint unless you use a stain blocking paint first like B-I-N pigmented shellac.
 
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Old 10-21-15, 05:38 AM
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Most any oil base primer will also seal the chalk. Sometimes a 2nd coat of latex alone will cover it but there is no guarantee. Why do you feel you need to mark the entire run of the ceiling joist? A small piece of blue painter's tape every so often might be a better method.
 
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Old 10-21-15, 06:40 AM
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Chalk

Note the permanance rating of 0 on this one:

Dewalt | 8 Oz Chalk - Dust Off Violet | Home Depot Canada
 
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Old 10-21-15, 07:15 AM
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Most red chalks are designed to *not* wipe off. I've found white chalk the easiest to remove and cover over, although it is hard to see on light surfaces.
 
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Old 10-24-15, 08:38 PM
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Thank you for the response. I was mistaken I just needed to locate the entire ceiling joist just so that we could install overhead fluorescent lighting fixtures. I really don't need to locate the entire length of the studs/joist but at least 3' - 4' length of the joist.

Thanks again
 
 

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