car paint: TOOLS
- A sander
- A sanding block
- Scotch pads
HOW TO REPAIR A SCRATCH IN THE CAR PAINT
The best way for me to start is to explain how to repair a scratch in the car paint of the body work.
First you would need to make sure that any plastics or rubber trimmings are removed around the car paint of the panels, in case they get damaged during the prepping process.
Now for the scratch the best thing to use is an air or an electric sander, the most important thing to remember is to keep the pad of the sander flat in order to not dig out a dip in the old car paint already on the body panel. The reason not to sand a dip is because the end result of the car paint finish in the body panel will be seen as a ripple in the paint shine. It should be flat, you might not get it perfect but so long as its 70/80 percent, the primer will do the rest of the work when rubbed down.
If the car paint feels like its not flatting enough to feather back, its sometimes quicker and easier to do with a block. This would make the car paint on the body panel flat, due to only being able to follow the surface of the block. This is best on a flat surface, for example the middle of a door, than on the curve of a wheel arch. You can still use the round sanding paper on the block.
Using a 240 grit pad, to evenly rub back the car paint.
The sander itself would need a 240 grit sanding paper on it , in order to be efficient in taking out the scratch, evenly spread the car paint, an then running your hand over the whole area to feel if you can notice the difference in shape of the body panel, were the paint is sanded.
Once you are completely satisfied that the car paint is smoothed out enough the next step would be to prep the car paint on the rest of the body panel.
Keeping with the sander for now, the paint that’s around the scratch is going to be keyed up for paint adhesion, and the better this is performed the better the finish and stability of the paint itself.
The next sanding paper needed is a 800 grit. The main thing to remember whilst sanding the body panel, is to try and not go through the paint layer of the lacquered top coat. Reason for not rubbing through the lacquer, is you might not want to put color across the whole body panel. I would say not to use the block with this paper. The action of the sander with the 800 grit is what gives it the smooth finish, and an even surface to paint on.
Once you have finished all the sanding, its time to scotch the parts you could not get to on the body panel with the sander.
Make sure to key up the shine on the body panel that is left after sanding, this is important to do, it makes the car paint stick to the edges, if there is shine when you apply the car paint to the body panel, when it is dry and your driving it down the road the paint has nothing to grip to, and is more than likely to peel away. Mainly in the edges of the door shuts. and were the rubbers and trims will be.
Make the panel a formatted matt finish all over car paint and body panel with a scotch, and it will be fine.
If you have any questions about car paint and body, i will do my best to answer them. Thank you.