If you want to start learning how to do some auto body repair, then it makes sense to walk before you can run. It’s probably not a good idea to get under the hood of your vehicle with a wrench and tool around and see what happens. By learning smaller, simpler acts of collision repair, you can ramp up to the bigger stuff. So maybe you should start with scratch repair?

Scratch repair is relatively simple, but that’s not to say it’s easy. A lot of people make mistakes when they attempt scratch repair, and not just amateurs, professionals too. So, whether you’re attempting some DIY auto body repair or evaluating the work of technicians, here are some common mistakes to avoid when it comes to scratch repair.

Scratch repair

Scratch repair might represent an appealing entrée into the world of auto body repair, but many drivers may not see much of a point. After all, a scratch is hardly a debilitating injury for a vehicle. You can drive with one, two, or even a hundred scratches on your car. So, what’s the impetus to fix scratches in the first place?

Well, for one, they’re unsightly. Not everyone cares deeply about the appearance of their vehicle, and that’s OK, but many people do. Especially people who own high-end vehicles (though not exclusively). And if you’re looking to sell your vehicle, you’ll very likely get a higher price if you fix all the scratches first. And whether you do it yourself or go to a shop for professional scratch repair, there’s a good chance you’ll make more than your money back from the increased sales price.

But even if you’re not particularly fussed about the appearance of your vehicle and you have no plans to sell it, you should still get that scratch repair sooner than later. Scratches expose the underlayers of your vehicle. If moisture gets in under the paint, it can eat away at the panel underneath. This corrosion spreads over time, weakening the structural integrity of the panel and possibly the whole shell of your vehicle. Fixing this only gets more expensive as time goes by, and it could even jeopardize your safety, but scratch repair can nip all that in the bud.

 Common scratch repair mistakes

Here are some frequent errors to avoid when attempting scratch repair:

Skipping proper surface preparation

Many DIY-ers jump straight to applying touch-up paint without properly sanding or even cleaning the scratch and the surrounding area. This is a bad start.

Dirt, wax, and oxidation can prevent new paint or clear coat from bonding properly, leading to peeling or flaking.

Using the wrong materials or tools

Household items, such as nail polish, generic sandpaper, or paint that’s not designed for automobiles, are not appropriate substitutes for professional auto body repair tools and materials. They don’t match factory finishes and can cause more visible damage and create an uneven texture.

Over-sanding the scratch

Sanding is often a necessary step in scratch repair. Sanding feathers the edges out and can remove clear coat damage. However, using sandpaper that’s too coarse or pressing too hard can cut through layers of paint unnecessarily, turning a light scratch into a bigger repair job.

Poor color matching

If you buy your own paint, you can shop by general color code. But this might not give you an exact match. Even small differences, such as metallic flakes, shade variations, or the age of the existing paint, can make the new paint stand out. DIY-ers sometimes apply their touch-up paint without blending, leaving a noticeable blotch where the scratch was.

Applying too much paint or clear coat

It can be tempting to load up paint to thoroughly cover up a scratch. The problem here is that thick layers dry unevenly, may trap air bubbles, or might form ridges that are harder to sand and polish smooth afterward.

Professional scratch repair pitfalls

After reading all the above mistakes, you might be thinking, “Forget that I’ll just go to a collision repair shop”. There are lots of skilled auto body repair technicians out there who can fix just about any scratch. But you need to find the right technicians with the right tools, otherwise your professional scratch repair might not look so, well, professional.

Here are some mistakes to watch out for when going to a collision repair shop for scratch repair:

Inadequate colour blending

A reputable auto body repair shop will blend the touch-up paint into the adjacent panels so it looks seamless, even under different lighting. If a shop just sprays the scratched spot without blending, you might notice a mismatch in the sunlight.

Rushing surface preparation or curing

Time is money in a shop, but shortcuts—such as not letting the primer, base coat, or clear coat fully cure before sanding or polishing—can lead to an ugly scratch repair. The result will likely be peeling or dull, uneven spots.

Over-polishing or buffer burns

Collision repair shops sometimes overuse rotary polishers to blend the area. If not careful, this can leave swirl marks or even heat damage to the clear coat.

Non-matching paint

Not getting the perfect colour match is one of the major issues with DIY scratch repair. But this problem haunts the pros, too … well, at least some “so-called” pros.

The truth is, it’s imperative to visit a collision shop that has high-quality colour matching technology and techniques. “Close enough” really isn’t close enough; even a slight mismatch will show up in certain lighting, and this can make an otherwise great scratch repair look bad. That’s why, as with all things, finding a reputable auto body repair shop with the right equipment is your key to problem-free repair.