There’s nothing to repair but the material itself. Procedures vary according to the plastic and repair metho but a few guidelines apply across the board. The standard solution for trying to make cracked plastic less noticeable is putting duct tape on the under side, then maybe using some type of plastic glue on top. Before starting to repair , make sure of a good preparation of the damaged area.
Plug-in the iron and leave it for a few minutes to warm-up. But plastics are easier to work with than you might realize. Plast-aid is a multipurpose repair plastic used for countless applications.
In this instructable, I will demonstrate how to not only repair a broken piece of plastic , but even to do some rudimentary molding to fabricate plastic parts. The piece I will be repairing is a large cover for an air handler in a automobile. I sanded then cleaned and put this glue on. It did not hold up to the vibration in the engine bay.
After all, there is high-pressure, high-temperature coolant in the radiator tank. Depending upon the material makeup of the plastic , it can be repaired in a number of ways by using different products and applications. The trick is to repair the crack or split. The resulting bond and repair is much stronger than the original plastic and will never break.
