When installing preformed thermoplastic pavement legends (such as "STOP" or "ONLY"), how is the material fused to the asphalt substrate?

1. Cold pressed onto the surface using a heavy 5-ton steel drum roller compactor.
2. Heated in-place using a propane torch until the material melts and flows.
3. Soaked in chemical solvent activator for 10 minutes prior to placement.
4. Nailed down at 6-inch intervals using heavy galvanized masonry nails.