Yes, they are slow payers. We received half payment for a job at 85 days after threatening to sell the debt to an agency, then sold the remainder anyway for .75 on the dollar. Agencies pay the most for debt that is <30 days, so it's useful just to ask for partial payments sometimes to keep the debt current. Another tactic that depends on state law, have your lien paperwork ready and state to the sign contractor: "Look, we don't want your customer to get this Lien Notice on a sign they've probably already paid you for. It's our policy to file lien at 90 days unless we know you've sent payment." Even if your state works differently, the slow payer is not likely to call your bluff.
