If you are repainting a similar color, you can lightly scuff sand to remove the gloss and clean the surface. Next, simply repaint over the existing latex coating. More than one coat may be needed for uniformity.Please note that switching sheens or drastic color changes may require a primer to minimize the amount of topcoats used.WARNING! If you scrape sand, or remove old paint, you may release lead dust or fumes. LEAD IS TOXIC. Wear a properly fitted NIOSH approved respirator and prevent skin contact to control lead exposure. Clean up carefully with a HEPA vaccum and a wet mop.
You can take some denatured alcohol or fingernail polish remover on a cloth and lightly rub it on an inconspicuous test area. If the paint softens and is easily removed, then it is a latex paint. If the paint does not really seem to be affected by the test, it is typically an alkyd coating.
There are several reasons why paint will not cover in one coat. Some of the main reasons include drastic color changes i.e. light to dark color or even dark to light color, thinning the product, stretching the product near or beyond its coverage rate, or improper roller cover used.
In general, flat and low sheen paints do not have a high amount of scrubbabilty. Areas that are of higher traffic or that are washed should be painted with a higher sheen product. At minimum, a Satin type or higher sheen is usually recommended in those areas for their overall durability.
Depending on color choice, atmospheric conditions, and other variables, latex paint may take up to 60 days for a "full cure". In most cases, latex paint can be put to normal use after a day or two. Fresh latex should be allowed to cure for at least 14 days before attempting to wipe or wash the walls. It can be sensitive to water or chemicals during the curing process. Also see the previous question regarding sheen choice. Lower sheens will be more susceptible to moisture and chemicals even after fully cured.
In most cases and with the latex technology used today, this should not be an issue. The surface to be painted needs extra attention in preparation to be repainted.WARNING! If you scrape sand, or remove old paint, you may release lead dust or fumes. LEAD IS TOXIC. EXPOSURE TO LEAD DUST OR FUMES CAN CAUSE SERIOUS ILLNESS, SUCH AS BRAIN DAMAGE, ESPECIALLY IN CHILDREN. PREGNANT WOMEN SHOULD AVOID EXPOSURE. Wear a properly fitted NIOSH - an approved respirator and prevent skin contact to control lead exposure. Clean up carefully with a HEPA vaccum and a wet mop.
Flat, Matte, Eggshell, Low lustre/Satin, Pearl, Semi-gloss, High-gloss
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