 You can reach us at 888-MONEYPIT or by going to moneypit.com slash ask and clicking the blue microphone button. You can record your question and it will get the fastest possible response. All right. Nicole reached out to Team Money Pit saying, what is the rule of thumb for painting over water stains? I recently fixed a leaking second floor shower, but I've noticed that there's a black stain around a nail hole where the leak occurred, which I assume is mold. It could be rust, though, too, right?