If a friend's car was keyed while at my house for a party, will he be able to file a claim?

A friend of mine had their car keyed while they were at my birthday party last week. I'm willing to pay his deductible, but will his insurance company pay for the damage?

It really will depend on whether your friend's auto insurance policy includes comprehensive coverage. Beyond that, the damage to the paint will have to be higher than his deductible before his insurance company will pay for anything. I would recommend asking your friend to get a repair estimate before he contacts his insurance provider so you two can make a more informed decision on how to proceed forward.