You don't need to...just take a cotton swab with nail polish remover on it...if you wipe the wall and the paint comes off...its latex.Can I take a chunk of old paint from my wall and take it to a store to see if its Latex or oil based?
No need to go to that trouble! Here's how to tell.
First, scrub a small area with a solution of household detergent and warm water. Rinse well and towel dry. Then soak a cotton ball, Q-tip or soft rag in alcohol and rub it back and forth over the cleaned area.
If paint comes off, it's latex and another coat of the same is in order. If the paint doesn't come off, it's oil-based, and an oil-based primer is a must.
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