How to repair plastic radiators.

Urethane Supply Company has everything needed to repair and refinish plastics. From plastic welders to instant glues to epoxy fillers to paints to primers, you name it. Some of our products that you may be familiar with are: Mini-Weld Airless Plastic Welder, Plastic Magic Adhesion Promoter, PlatiFix plastic repair kit (not to be confused with Plastex plastic repair kit), Bumper and Trim Black (not to be confused with Forever Black), Wax Blaster wax remover, Flex Filler (not to be confused with Duramix), Black Cat primer (not to be confused with Transtar Hydroflex), Insta-Weld adhesives (not to be confused with Crazy Glue or LocTite), Bumper and Cladding Coat, ATV Fender Welder, Kayak and Canoe Welder for Pelican canoes, FiberFlex welding rods, Uni-Weld welding rods, EZ Weld Hot Air Plastic Welder, Steinel hot air plastic welder. We also carry a complete line of plastic welding rods. For example, we manufacture ABS welding rods, Polypropylene welding rods, Polyethylene welding rods, TPO (TEO) plastic welding rods, Polyurethane welding rods. In addition to the products you need to repair plastic, we also have detailed instructions and tutorials with step-by-step instructions on how to repair plastic.

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How To Repair Plastic Radiator Tanks

Don't try to use an adhesive

The temperature and pressure from the radiator will cause adhesives to come off of plastic radiator tanks. The only way to get a permanent repair on plastic radiator tanks is to use a plastic welder.

Plastic radiator tanks must be able to withstand high temperatures and pressures. Nylon has a very high melting point and is used on every radiator tank that we have ever tested. To give the tank enough strength to withstand the pressure, glass fibers are added to the nylon. Now that you have an understanding of radiator tanks, you need to know how to repair them. Here is how it's done...

Step 1

cracked radiator tank Getting good penetratrion is very important when welding nylon radiator tanks. For that reason, you need to v-groove the crack. In this photo, we are using a V-grooving tool. If you don't have a V-grooving tool, use the tip of the welder to melt in a v-groove.

NOTE: You may hear some crackling sounds when you do this. The crackling sound is from the glass fibers, and is normal for this repair procedure.

Step 2

preheat plastic Nylon is a very high melting-point plastic. If you preheat the area with a heat gun, the repair will go much quicker. Keep the heat on the area until you see the plastic start to look glossy. Wait a minute or two and allow the heat to "soak in", then reheat it again. When you feel comfortable that the plastic is heated all the way through, you can go to the next step.

Step 3

weld Using the nylon welding rod with the airless plastic welder, lay down about 1 inch of melted rod. Remove the rod from the welder and work the melted rod into the plastic. You will know when you have good mix, because the rod will take on the color of the radiator. Keep mixing the melted rod with the melted base material until it is well mixed.