Rub-in an instant cast-iron lustre with easy-to-use Manifold Dressing Your project vehicle\'s exhaust manifold will look like new after you rub it down with Calyx Manifold Dressing. It\'s easy to apply and long-lasting. Rub-in with rag or toothbrush No disassembly required Enough for 8-10 typical V8 exhaust manifolds Application: For the best results, manifold should be removed, abrasive-blasted, and wiped down with PRE Painting Prep (10041Z) before applying. If you wish to apply Calyx while the manifolds remain installed on the engine, use a wire brush to remove surface rust and dirt, then wipe down with PRE. Apply Calyx with a rag or toothbrush, and work it into the pores of the metal. For a buffed appearance, use a fingernail brush.