Question

why paint become hard when left open​

Answer 1

Explanation:

It is because the molecules in paint react with air surrounding it. Thus, making the paint hard.

Answer 2

ლHow long can paint be left open?

two years

Water-based acrylic and latex paints can stay good for up to 10 years if never opened and kept from freezing. Leftover paints that have been opened should be closed up tightly, stored in a cool, dry place and used within two years.

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