Innovative fiber reinforced compound allows large repairs to be filled in 1 application. Dries 5 times faster than other 3M spackling compounds. Ideal for repairing large holes, cracks, and damaged large surfaces in drywall, stucco, and wood. No shrinking, cracking, or sagging. Firmly holds nails and screws. Hides repair after painting. Sandable. Tub fits a3 In. putty knife. Interior/exterior. Ready to use.