1. Bake the scratched parts with oxygen-acetylene flame (control the temperature and avoid surface annealing), bake out the oil that has permeated the metal surface all the year round, and bake until there are no sparks.
2. Treat the scratched parts with an angle grinder to a depth of more than 1 mm, and grind out grooves along the guide rails, preferably dovetail grooves. Drill holes at both ends of the scratch to deepen and change the force.
3. Clean the surface with absorbent cotton dipped in acetone or absolute ethanol.
4. Apply the metal repair material to the scratched surface; the first layer should be thin, evenly and fully cover the scratched surface to ensure the best bonding between the material and the metal surface, and then apply the material to the entire repaired part and press repeatedly. Make sure the material is filled to the desired thickness, slightly higher than the rail surface.
5. It takes 24 hours for the material to fully achieve various properties at 24 degree . In order to save time, the temperature can be increased by halogen tungsten lamps. Every 11 degree increase in temperature, the curing time will be shortened by half, and the optimal curing temperature is 70 degree .
6. After the material is cured, use a fine grindstone or a scraper to repair and level the material above the surface of the guide rail, and the construction is completed.
