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Therefore, you can start skim coating and repairing all the defects after the Cal-Cote is dry.Trying to scrape and “skim coat” (When you use joint compound to cover the cracks and defects caused by a failed coating) you will notice the joint compound starting to bubble. One way to determine if your ceilings are calcimine is to check the underside of a paint chip. You can always ask your local paint store what type of product they carry and the coverage rate of that particular product. Depending on conditions, (How humid is it?) I would allow the joint compound over night also.Out here in New England we have older homes that in the earlier days used lead paint or had lead mixed in with the oil paints. One other thing, Cal-Cote is a very thick product. Unlike a latex or oil, based paint, which will typically cover 300 sq feet per gallon, expect to get about 200 sq per gallon.There are products out there that deal with calcimine directly. Definition: cal·ci·mine also kal·so·mine n.. A heavy coating will seal the ceiling and give you a surface to work with. Then seal the original ceiling (as is) before repairing. A white or tinted liquid containing zinc oxide, water, glue, and coloring matter, used as a wash for walls and ceilings. If it is chalky more than likely, it is calcimine. The best way to approach this is to scrape as much as the loose ceiling as possible.When all sanded, apply another coat of Cal-Cote and your ceiling should last quite a long time.)After you have applied the skim coat to the ceiling you will need to allow the compound ample time to cure. The acid in the calcimine is breaking down the joint compound. (Typically allow it to dry over night. One of the biggest problems was “Calcimine” ceilings. Then when sufficiently cured you can sand (wearing a mask and goggles) to achieve a smooth finish. Following these steps will help in fixing those old calcimine ceilings.At first glance, the ceilings look like ordinary latex or oil painted ceilings when in fact calcimine is acidic and if coated over with standard latex or oil based paint with fail almost immediately. One such product is.