painting stained concretee basement floor?

Working on revovating my Mother's basement. We pulled up rubber backed carpet that had been down at least 40 years. This left a lot of rubber carpet backing and glue stuck to the concrete. Scraped and scrubbed until the floor looks and feels like clean concrete but it is still stained black by what was there before. I had wanted to use a stain on the floor but I'm now thinking I'll have to paint it. So the question... do I need to use some kind of primer on the floor to seal the black stain so it doesn't bleed up through the paint...and if so, what kind of primer?
Tom G.
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If you can get good ventilation down there, the best way to go is two part epoxy paint. But ventilation is very important.

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