Pissed about unpaid invoices on big Sherwin-Williams jobs

Got a couple commercial painting gigs where the client stiffed me on the final $2,500 payment each, both using Sherwin-Williams Emerald paint that I sourced upfront. Been chasing them for 60 days now with no luck, and it's killing my cash flow for the next round of supplies. Watching that Idaho Painter video made me think I should've put stricter terms in the contract from the start. This collections BS is the worst part of the job.

Put a mechanics lien on the property if it's been over 30 days, works every time for us on paint jobs.