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7 Tips on How to Repair Minor Car Damage

7 Tips on How to Repair Minor Car Damage

Selling a car with repaired minor damages can increase your profit. Read our guide on how to do minor car repairs with damages such as scratches, dents, and cracks.

Buying a damaged car and repairing it yourself can be a great way to increase those profit margins for you as a car trader.

Scratches, dents, textile or leather damages, etc. - these are all damages to which you can easily find a DIY solution, save money, and increase your sales. All you need are a handful of tools and some patience.

Before you start getting your hands dirty, let’s look at some of the most common minor damages and what you can do to fix them yourself.

Most common minor car damages and fixing them yourself
1. Scratches
2. Dents
3. Windshield cracks
4. Damaged interior
5. Alloy wheel damage
6. Bumper cracks
7. Car rust

1. SCRATCHES

Scratches can be annoyingly easy to get. All you need is a branch sticking out a little bit too much or a split second of miscalculation as you’re parking the car, and the damage is already there.

To understand how to solve a scratch on the car, we must first understand the four layers that make up the coating of any vehicle - the e-coat, primer, basecoat, and clearcoat / topcoat.

Source

How to actually tell how deep a scratch is? Easy! Just run your finger over the scratch and see how it feels. If your fingernail doesn’t catch on it, good news, you’re dealing with the most straightforward scratch of them all - the clear coat scratch.

Does your fingernail catch on the scratch? Then it’s a deeper scratch that cuts into the base coat or even the primer, and the repair process will take more time and tools.

Let’s start with the easiest scratch to solve, which is a scratch of the clear coat.

Minor scratches - Clear paint pen

Clear paint pens don’t actually contain any color, only clear lacquer. So you can imagine this solution will only work for minor scratches on the top coat.

These pens will only disguise the damage instead of solving it, like putting a band-aid on a cut.

As with all repairs, you should clean and dry the affected area first. Then simply use the pen over the scratch. The pen will somewhat disguise the scratch, but it will still be visible up close.

Minor scratches - Color paint pens

Definitely an upgrade from the clear paint pen! These pens do contain paint, and the process requires more steps, although it’s still incredibly simple.

You can buy cheaper paint pens in pre-made basic colors like white, black, red, etc. However, the chance of it not matching your car’s color is high, and it can look even worse after the “repair”.

A better solution is to have a custom paint pen done for you so that you can color match perfectly according to your vehicle’s color code - aka your car’s original paint color. Here is an example of how to find your BMW’s color code.

Now that you have either a standard or a custom paint pen, here is how to use them:

Clean and dry the area with the scratch.
Apply a thin layer of primer over the scratch and wait for it to dry.
Make sure the pen is ready to go by pumping it over another hard surface (not the car). When you see the paint coming out, wipe away the excess and apply it to the vehicle.
Allow the paint to dry, then seal it with a top coat.
Polish and wax.

Minor scratches - Car scratch remover

Another solution for scratches that affect the top coat is scratch removers. These are essentially micro-abrasive compounds that remove scratches by removing the top coat of the car’s coating. In short - they remove the scratch by physically polishing it away.

It’s essential that the base coat is not affected by the scratch, as these compounds depend on the existence of a layer beneath the scratch.

The most significant advantage of this option is that you don’t have to worry about finding the exact color match, like with the paint pens. The most popular scratch remover of this kind is the iconic T-Cut.

Here is how to use a scratch remover:

Clean and dry the area.
Apply the solution or the paste in circular motions, ensuring you focus on the affected area.
Rub gently until you can no longer see the scratch.
Take a clean cloth and wipe away any excess product.
Wax generously since this area no longer has its protective top coat.

Deeper scratches - Fillers and paint

Unfortunately, some scratches require more than a paint pen or a scratch remover kit. For cases when the basecoat or the primer layer has been damaged or the affected area is too big, you will need a few extra tools and some patience.

Here is what you will need:

Spray primer
Spray paint in the color of your car
Spray clear coat
600 grit sandpaper
180 grit sandpaper
80 grit sandpaper
Sanding block
Body filler

And this is the entire process:

As always, clean and dry the area.
Start by using the 180-grit sandpaper to smooth out the whole surface of the scratch.
After the entire area is smooth, remove the sandpaper dust with a clean cloth and apply a thin layer of body filler.
Wait for the body filler to dry completely.
Sand down the dried body filler with an 80/180-grit sandpaper to completely smooth out the surface.
Use masking tape and plastic sheets to isolate the area from the rest of the car.
Spray three coats of primer, ensuring that each layer is dried before you apply the next one.
Smooth it out once again with 80-grit sandpaper.
Spray the paint in 3-4 layers until it looks natural.
Finish it off with a layer of clear coat.

For the entire tutorial, check out this Youtube video.

2. DENTS

Dents are another typical damage you’ll inevitably find yourself fixing as a car trader looking to turn a profit by repairing and selling cars. A dent is an area of indentation caused mainly by collision or projectiles like stone or hail. As with scratches, solutions to dents vary from extremely easy to those requiring more tools.

Minor dents - Plunger

This might sound weird, but trust us, it works. All you need is a plunger (the one for your toilet) and some Vaseline.

Start by cleaning and drying the area of the dent.
Spread some Vaseline over the edges of the plunger and then put the plunger over the dent.
Work the plunger until the dent pops out. It’s that easy!

Minor dents - Suction cups

Similar to the plunger method, this one is used for more minor dents. The process is precisely the same. You can use water instead of Vaseline to make the cups form a vacuum seal over the dent. Then pull the cups, and repeat the process until the dent pops back out.

Minor and bigger dents - Glue pulling

Glue pulling is a very popular and effective PDR (Paintless Dent Removal) technique. You can use glue pulling on its own, but it is typically also combined with metal rods used to “massage” the dent from the other side (if it can be reached).

If you can’t reach the dent from the other side of the panel, you can use only glue pulling. How does it exactly work?

First, get yourself any DIY glue-pulling dent kit on the market, like this one.

Choose the right size of the pulling tabs for the size of your dent.
Heat up the glue gun and apply a generous amount of glue to the bottom of the tabs.
Stick the pulling tabs onto the dent and wait for the glue to dry.
Place the pulling tool over the tabs and start pulling.
The dents should pop out with each movement. Repeat the process until the dents have popped out.
Remove any glue residue with alcohol.

In the glue-pulling process, there is a high chance you will create raised areas. You can smooth those back down by using a hammer that is usually provided in DIY kits like these. Tap over raised areas very gently and in circular motions.

For hail damage or any other damage where you can easily access the other side of the affected area, you can combine glue pulling with special PDR bars. First, heat up the dented area with a hairdryer, so the paint doesn’t crack, and then use the bars to gently push the dents out. This will, again, probably create raised areas, but you can solve that with the rubber hammer and gently tap them back down.

Take a look at this Youtube video for the entire tutorial on how to combine glue pulling and PDR bars.

3. WINDSHIELD CRACKS

Believe it or not, there is a repair kit for everything, including cracks in the windshield, as long as the damage is not too significant. Kits like these work best on minor damages and can be quite successful in repairing them. If you have a crack that splinters off like a spider's web, the windshield is beyond repair and needs replacing. Keep in mind - the damage might still be visible if you look at it closely, but the results can also be mind-blowing.

Here is how the kit works in brief:

Clean and dry the windshield with a microfibre cloth and rubbing alcohol.
Apply the provided liquid resin onto the crack, following the instructions on the kit.
Create a vacuum seal with the provided tools and wait for the resin to dry.
Remove excess resin with the provided safety razor.

For the entire process and detailed instructions, take a look at this incredible Youtube tutorial.

4. DAMAGED INTERIOR

So far, we have talked about exterior damage, but you should also pay attention to interior damage. After all, the inside of the car is where your customer will spend most of their time.

The most common minor interior damages include tears in the carpets, damaged vinyl, tears in the leather, and bad odor.

Minor carpet damage

If you encounter a small tear in the carpet, look no further than the good old needle and thread combo. A running stitch will solve all your problems.

You can purchase a car carpet repair kit if you’re dealing with a small hole or burn in the carpet. With the help of this kit, you’ll be able to cut the affected area out and replace it with a fabric piece from the kit. This replacement piece is then glued onto the bottom of the carpet, and you’re done!

Damage to vinyl and leather

Yep, you’ve guessed it - there is a vinyl and leather repair kit. Mixing the provided colors to get the exact color of your affected vinyl/leather requires a bit of trial and error, but it’s worth it.

You can also use a leather repair compound or liquid leather to patch up any leather cracks and holes.

Bad smell

Not exactly a damage, but definitely something your customers won’t like. Selling a great-smelling car will score you extra points with your clients and make you look super professional.

Baking soda is the easiest and cheapest way to get rid of bad smells or deodorize any textile. Sprinkle a generous amount of baking soda onto any interior textile surface of the car and let it sit for a couple of hours, or better yet, overnight. Vacuum the baking soda thoroughly and say goodbye to bad smells.

5. ALLOY WHEEL DAMAGE

Alloy wheels can quickly get scratch marks on them, especially around the edges of the wheel. The repair process is similar to how you would deal with any scratch.

Alloy repair kits are straightforward and will provide you with sandpaper, filler, and paint. As always, these are better suited for more minor damages on the edges of the wheel. Before you buy the kit, make sure the provided paint matches the color of your alloy wheel.

This is how you use an alloy wheel repair kit:

Start by cleaning the wheel thoroughly to remove all dirt.
Smooth the damaged area with grit sandpaper (provided in the kit).
Use the provided filler to fill in the scratches and allow it to dry.
Smooth it out again with sandpaper.
Apply masking tape to isolate the area before you apply paint.
Paint over the filler and wait for the paint to dry between applications.
Apply a top coat to seal the paint.

6. BUMPER CRACKS

Bumpers are easy to damage since they are the first point of contact in any collision, and nowadays, they’re made from plastic. So even though a bumper crack looks scary, it’s pretty easy to fix with the help of some bonding glue, filler, and a fresh coat of paint.

Bumper cracks might be the only thing in this article that is slightly more complex and requires more skill, but we’re here to help explain the step-by-step process!

You’ll need to get ready for a lot of sanding, sealing, gluing, and painting. First, you’ll need a bumper crack repair kit. These kits come only with plastic fillers, so you’ll have to buy paint and a top coat separately.

How to use a bumper repair kit:

Remove the bumper completely to get access to the inside of it.
Sand the edge of the crack (from the inside) so that the edges of the crack and smooth. The plastic filler will be able to hold better this way.
Use a bit of acetone or alcohol to clean the crack both on the inside and outside.
Now that the edges have been sanded, use strong masking tape to reattach the two sides of the crack to one another (on the outside). Don't use masking tape on the inside because this is where you'll be applying the filler. The inside should still show the crack.
Use the bumper filler to fill in the crack on the inside.
Let it sit overnight to let the bonding mixture works its magic.
Remove the masking tape to reveal how the crack looks on the outside. It should look smooth.
Proceed with the same steps as in our "Scratches" tutorial - fill in with filler, sand again and repaint.

Check out this Youtube video for a detailed tutorial on the bumper crack repair process.

7. CAR RUST

Rust happens when iron comes in contact with oxygen and water. Usually, it’s best to prevent surface rust with wax, but if you’re purchasing a car with some surface rust damage, don’t worry - it’s super easy to solve.

How to tell if rust is forming on the surface of the vehicle? Easy - bubbles under the paint. Bubbles mean that the paint is no longer attached to the base metal layer, so water and air are able to gather in between. Those areas will develop rust.

Here is how to remove rust from a used car:

Start off by using a coarse 80-grit sandpaper or a mechanical sanding disc to remove any visible rust. The goal is to get to the base layer - the metal layer.
For this process, you’ll need fiberglass paste. Mix it with the correct amount of hardener and apply it to the damaged area.
Wait for the paste to harden and sand off any excess.
Apply body filler and proceed with the exact same steps described in the “Scratches” tutorial - fill in with filler, sand again and repaint.

For a very detailed guide on how to repair rust damage, take a look at this tutorial.

Minor car damages you can easily repair yourself

Fixing minor damages on used cars you buy as a car trader can be really easy and increase your profit. Vehicles that have been repaired actually sell for more than selling them with a few scratches at a lower price. Also, your profit margins are even higher, considering that vehicles with minor damages are cheaper to buy. It’s a win-win situation!

It’s important to know that minor damages are extremely normal for second-hand cars, and as such, they allow you to fix the car up and sell it for a higher price. Therefore, we recommend you take a look at our Quality Compliance page to fully understand which minor damages are not considered valid grounds for claims after your purchase.

This article will help you feel prepared and confident to resolve any minor damages, whether it's a small scratch or dent or a full-blown bumper crack. Make sure to equip yourself with the right tools and patience!