Start by rubbing the edge of the plunger with a damp rag to moisten the suction surface.
Repair small dent in car door.
This technique works especially well on large expanses of metal such as doors and fenders if they have only been bent inward.
A plunger works well for large shallow dents in a door or the hood.
Use a small amount of petroleum jelly or water to lubricate the edges of your standard cup plunger.
Make sure to use a cup plunger for sinks not a flange one for toilets.
Sand past the edge of the filler to create a smooth transition.
If your dent is in a plastic surface like a front or rear bumper cover and you can get to its inside surface you can pour boiling water over the area to soften it up then push the dent out from.
It may take a couple of tries before the metal pops back to normal.
To repair minor dents in your car bodywork try using a plunger or dry ice.
Just splash some water on both the plunger and the dent and start pushing and pulling until it pops out.
Then position the plunger over the dent and press the plunger towards your car.
Pull the plunger back toward you.
Just moisten the edge of the rubber place the plunger over the dent establish suction by pressing down on the handle and then pull it toward you.
Carefully apply the lubricated plunger around the dent and gently press inward making sure a tight seal forms.
Sand lightly and evenly over the entire surface of the repair with broad circular strokes.
Dent wizard technicians safely remove dents restoring vehicles to their original factory condition without affecting the original factory paint finish through a process called paintless dent repair also known as pdr.
The suction will hopefully pop the dent out as the plunger comes unsealed.
With your sandpaper wrapped around a sanding block rubber sanding blocks are best and can be purchased in automotive or home repair stores start sanding the filler using 150 grit sandpaper.