We are asked to send lien waivers from our installers before we get paid for a project. Is there a way we can use a pay when paid type of waiver that will alow us to pay them out of the project instead of out of "our" accounts. We sometimes use certified payroll forms for government projects and on those the installers state that they "are a self employed sole proprietor. Payment will be paid in a lulmp sum at the conclusion of the job. The job was billed at the rate equal to prevailing wage and total benefit package." Could this form be used as a sort of lien waiver?