This Plastic repair kit is very easy to use and makes a good permanent repair that can be sanded and finished.
Pictures below show repair on a broken tab on a 1969 Honda CT90 air cleaner housing. Unfortunately, you must have an undamaged part available to make the mold with the material that is included in the plastic repair kit.
If you don't have a part available, you can still use the repair kit, but the repaired part may not look exactly the same as original.
Immerse the blue silicone form in hot water.
After the silicone is soft, make the form around the new part you need to duplicate.
In this case it is the tab on the air cleaner. Let the form firm up and then take it off the the original.
If you don't have a new part available to duplicate, you can use plastic, wood or anything else to shape the blue silicone.
Clean the edges of the broken part for better bonding.
Attach the formed silicone to the damaged part to be repaired.
Use the powder to fill all the gaps
Use the activator liquid with supplied dropper to completely saturate the powder
Let the repair dry completely, then remove the mold. Inspect the repair carefully and add plastic powder in any voids on the underside of the repair.
Use a Dremel tool or similar to finish and sand the repair.
Sandblasted primed and painted part is shown above.