'Do I have to add primer to a conceret floor it has bitumen on it or should I scrape it off before I put down a latex screed?'

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'Do I have to add primer to a conceret floor it has bitumen on it or should I scrape it off before I put down a latex screed?'
 
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You would likely need a transition primer to convert from an oil based product to a water based.

Personally, I would NEVER touch a floor unless it were an epoxy (using a hardener/catalyst). A water based product is not going to stand-up to wear and test-of-time.
 

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