If the floor is already painted, it’s not always necessary to prime unless there are areas of peeling or cracking or maybe there is a foreign substance that can’t be removed. If priming, oil primer has to be used over an oil paint. You don’t want to use a latex primer over oil paint.
There are many high traffic floor paints, that may require a certain primer to be used directly with them. There are too many scenarios to mention here.
When buying your product, tell your paint pro what surface you are covering and what you’re trying to achieve. They will have all of the latest products and solutions.
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