Remove dust, grease scales etc.. Apply SOP by a brush to a maximum thickness of 1.5 mm. Allow it to dry. Apply a generous carburising flame at a point till the crystals stop glowing. It indicates sweating i.e. bonding of SOP with base metal. As the bonding proceeds, move the flame along at a rate sufficient to keep the sweating ahead of the flame. Width of the path depends on the surface area and base metal thickness.
On sections exceeding 6mm, carbon arc methods is recommended. Remove dirt, grease, scale etc. and slightly warm the surface. Apply SOP with brush to a maximum thickness of 1.5 mm. Allow it to dry. Use a pointed 6mm/8mm carbofuse (-ve polarity) for fusing. Provide beads of uniform width with crescent shaped weaves. Advance at a rate sufficient to keep surface sweating ahead of the arc. Overlap succeeding beads to ensure uniform penetration. Literature