You can use most super glues as well, but check the packaging to make sure it can be applied to plastic.
Strong glues have strong fumes. Work in a well-ventilated area or wear a facemask when handling the glue. Wear gloves when using strong glue to prevent it from getting onto your skin and becoming painful to remove.
You can use a C-clamp to hold the plastic together.
You can make glue dry faster if you don’t have time to wait for it to cure.
The water should not be boiling when you submerge the plastic.
Take the plastic out of the water periodically to test if it is soft enough to mold. You can use tongs to hold the plastic in the hot water. Don’t slosh the plastic around in the water. Allow it to sit undisturbed.
Wear gloves or use tongs to pull the plastic out of the hot water.
You can use a C-clamp to hold the crack together when you submerge it in the cold water, just be sure not to squish the plastic so it’s uneven when it sets. Take the plastic out of the water and check to see that it has hardened completely before using it. [9] X Research source Submerge as much as the plastic as you can. Cooling the entire piece will help the recently molded plastic set better.
Acetone can emit noxious fumes, so be sure you’re working in a well-ventilated area or wearing a facemask when you use it.
Do not get the acetone on your skin as it can irritate it. If you can’t match the same type of plastic, try to match the color as best as you can.
You can speed up the time it takes the scrap plastic to break down by cutting it into smaller pieces. If the plastic sludge has any large lumps of plastic in it, it may need more time to disintegrate.
Acetone can eat through plastic and damage your grass so do not empty the acetone in the garbage or outside! Any small amount of acetone left in the container will evaporate quickly.
Apply the liquified plastic to the underside of the crack so it won’t be as visible.
Soldering irons are available at hardware stores and the home improvement section of many stores for about $10.
Do not rest the soldering iron on anything flammable while it heats up. Make sure the tip of the soldering iron is clean of any residue. Plastic melts much easier than metal, so your soldering iron does not need be higher than 400 °F (204 °C).
Use a clamp to hold the crack together and allow you to use both of your hands to solder. If you do use a piece of scrap plastic as a patch, cut the plastic to a size that fits the crack, and try to use the same type and color of plastic.
The soldering iron will be very hot, so take be careful not to burn yourself or anything around you when you’re handling it. Melting plastic can put off fumes that are harmful. Work in a well-ventilated area or wear a breathing mask to avoid breathing in the fumes.
Wait at least 1 hour before using the repaired plastic.
You may need to scrub the tip of the soldering iron with a brush to remove the residue. You can use a cleaning solution to clean the tip, but make sure the iron is unplugged first.
