I am nearing completion of a serving tray. The handles are held in place with #8 stainless machine screws. The heads appear inside the tray but at ~5/16" diameter they shine intrusively like headlights. I cannot countersink them because they abut the dado for the bottom of the tray. Black acrylic model paint does not adhere to them. A Sharpie is not dark enough. I don't want to buy gun bluing solution or scorch them with a torch (probably wouldn't work on stainless anyway). I have Dykem blue layout on hand which would do. Is there anything else I should consider?