Get the strength of plaster and the workability of spackling paste with Zinsser® Ready Patch Professional Formula Spackling & Patching Compound. This full-bodied product is durable enough for your most heavy-duty repairs, indoors or out. Full-bodied for heavy-duty interior/exterior repairs Shrink resistant - won't sag or crack like drywall mud Sticks to metal - ideal for dents in metal doors & siding Dries fast, cures rock hard - outperforms vinyl spackling Can be painted when dry to the touch For best results: Spot-prime patched areas, then prime the entire surface Ready Patch sticks firmly to all clean, dry surfaces - plaster, wood, drywall, wallboard, brick, concrete, stucco, paint and metal. No pre-mixing, no need to add water, no need to water-dip finishing blade to smooth Does not shrink, crack, crater or sag on normal applications Sands easily to a smooth, rock-hard finish ready for priming or painting Dries quickly on interior and exterior surfaces Mildew Resistant Film