How to repair cracks in plastic cups

Generally, polyurethane glue or special plastic glue can be used to repair cracks in plastic cups.
1. Use polyurethane glue
Polyurethane glue is a versatile glue that can be used to bond a variety of plastic materials, including plastic cups. Here are simple steps to repair cracks in plastic cups:
1. Clean plastic cups. Wipe with soapy water or alcohol to remove dirt from the surface of the cup. Make sure the cup is dry.
2. Apply polyurethane glue to the crack. Apply the glue evenly to the crack and press gently with your finger for a few seconds to make it stick.
3. Wait for curing. You usually need to wait about 24 hours until the glue is completely cured.

2. Use plastic glue
Another way to repair plastic cups is to use a special plastic glue. This glue bonds well to plastic materials, including cracks in the walls and bottom of the cup. Here are the specific steps:
1. Clean plastic cups. Wipe with soapy water or alcohol to remove dirt from the surface of the cup. Make sure the cup is dry.
2. Apply plastic glue to the cracks. Apply the glue evenly to the crack and press gently with your finger for a few seconds to make it stick.
3. Perform secondary repairs. If the crack is large, you may need to reapply the glue a few times. Wait at least 5 minutes each time until the glue sets.

3. Use plastic welding toolsIf the cracks in a plastic cup are severe, it may not be possible to effectively repair them with glue or strips. At this time, you may consider using professional plastic welding tools. Here are the specific steps:
1. Prepare materials. You will need a plastic welding tool, a small piece of plastic, and an instruction book.
2. Start the plastic welding tool. Start the plastic welding tool as directed in the instruction manual.
3. Weld the plastic pieces. Place the piece of plastic over the crack and weld it with a welding tool for a few seconds, then wait for the plastic to cool and solidify.
In short, depending on the size and severity of the crack, you may choose to use polyurethane glue, a specially made plastic glue, or a professional plastic welding tool to repair your plastic cup. It should be noted that after the repair is completed, you should wait for the curing time to ensure that the repaired cup becomes strong.