Get the strength of plaster and the workability of spackling paste with Rust-Oleum Zinsser Ready Patch Professional Formula Spackling & Patching Compound. This full-bodied product is durable enough for your most heavy-duty repairs, indoors or out. Hard curing resists shrinking, sagging and cracking. Efficiently fills gaps, holes, and cracks in metal and wood. It is smooth, easy to apply and very hard when cured.