URE-FIL 3 - ceramic filler which is added to urethane resins and castable epoxies to reduce cost. This filler is speckled grey in color and can give castings a stone-like finish;
Smooth-On URE-FIL fillers disperse easily in Smooth-On materials;
Recommended starting mix ratio is 1A to 1B to 1 part URE-FIL. Mix the filler in and confirm that there are no lumps of filler present. Often, employing the ‘double-mix and pour’ technique can produce better results;
To prevent moisture absorption, use filler as quickly as possible after purchasing. Decant filler from container and replace lid immediately. Do not leave container opened for more than a minute;
If filler will be stored for prolonged periods, obtain dessicant pouches at your local hobby/arts and crafts store and place one or two dessicant pouches in container. Replace used dessicant pouches every other time you open container. Make sure container lid is secure before storing.