Short-strand fiber glass putty used for bridging holes in steel and fiber glass panels. Putty forms a hard durable surface, however its shortstrand formulation enables it to be easily applied and sanded. Specially formulated for the professional it can be top coated with putty or directly top coated with paint. 3 Liter Can Includes hardener Surface Preparation U-POL Fibral Lite putty can be used on the following Steel - degrease and abrade with 80 grit paper. Fully cured paint surfaces - degrease and sand with 180 grit paper. Glass Fiber - degrease and sand with 80 grit paper. Mixing Ratio 100% by weight U-POL Fibral Lite 3% by weight U-POL hardener for putty. The exact mixing ratio is not critical although over or under catalyzation may affect the gel time. Pot Life Rapid curing and non shrinking once mixed, 4-5 mins. at 70ºF with 3% hardener. Drying Time Sandable after 20 mins. at 70ºF. Application Smooth creamy putty it will not sag even on vertical surfaces. Sanding Begin sanding with 80 grit paper using finer grades to finish such as 120 then 220 grit, for rotary sanding equipment a hard back plate is recommended. Hand sanding can be done wet or dry. This item can only ship by ground within the Continental US. Next Day or 2nd Day, AK & HI, & International delivery not available. /* */