Garmaine asked 4 years ago
My house was built in 1971. After removing a think layer of popcorn, I found cardboard behind it. Does anyone know what that is? Is it safe to just paint over it?
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Edit:
JACK has the correct answer.
I'd just like to add that the reason why I scratched all these holes is that I didn't spray enough water onto the ceiling, so the bound between the popcorn and the ceiling was too tight for me to use a knife to separate them.
After learning my mistake, the rest of the ceiling got scraped off very smoothly.
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