Problem caused by owners corp, then. They have to fix the ceiling anyway because it’s common property but they may balk at the paint.
There’s a weird quirk in the “who’s responsible …” document that sayd the OC is responsible for repairing lot property when it is damaged while effecting a repair, but not for the damage caused by the failure of common property in the first place.
However, common law says that if something belonging to you damages something belonging to me, then you are liable.
Usually your home and contents insurance will pay for the paint job but if you don’t have cover (naughty, naughty) you could take the owners corp to a small claims court and demand payment there.
If there is anyone with an iota of sense on your committee, they will pay up and claim against their insurance. If their insurance is invalidated because they got someone who wasn’t qualified or insured to fit the leaf trap, it’s hardly your fault.