Custom trays are used in prosthodontics to make final or definitive impressions. Custom trays are fabricated mostly in special auto polymerizing acrylic resins called tray resins or visible light activated (poly urethane) resins. The following technique is a quick and effective technique to modify auto polymerizing acrylic resins whenever commercial tray resins are not available.

Keywords: Custom trays; Auto polymerizing acrylic resins; Tray resins; Talcum powder.