Having your car professionally valeted before taking it to a body shop might seem like a sensible idea. After all, a clean car should be easier to work on, shouldn’t it?
Unfortunately, some valeting products- particularly silicone-based sprays- can cause serious problems during automotive paintwork. What looks like a harmless dashboard dressing or tyre shine can contaminate the vehicle’s bodywork and potentially compromise the quality of the finished repair.
The Problem With Silicone Spray
Silicone is commonly found in car-cleaning and detailing products, including:
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Dashboard and interior trim dressings
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Tyre shine
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Plastic and rubber treatments
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Spray waxes and quick-detailing products
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Some polishes and protective coatings
These products create a glossy finish and help repel water. However, silicone can spread surprisingly easily.
When a silicone spray is applied, tiny airborne particles can land on paintwork, windows, door shuts and nearby panels. Silicone can also be transferred through cloths, hands, clothing and cleaning equipment.
Even when the contamination is invisible, it may still affect the refinishing process.
How Silicone Affects Automotive Paint
Before a vehicle is painted, the surface must be completely clean and free from oil, wax, grease and silicone. Automotive paint needs to flow evenly across the prepared panel and bond correctly to the surface underneath.
Silicone contamination can repel wet paint. Instead of forming a smooth, consistent coating, the paint may pull away from contaminated areas.
This can create defects commonly known as fisheyes or silicone craters. These appear as small circular marks or depressions in the painted surface, often with a visible centre where the paint has separated.
Once fisheyes appear, simply adding more paint may not solve the problem. The affected area may need to be allowed to dry, sanded back, cleaned again and repainted.
Contamination Can Travel Further Than You Think
The product does not always have to be sprayed directly onto the panel being repaired.
For example, tyre dressing applied around the wheels can be transferred onto the lower bodywork. Dashboard spray can escape through open doors and settle on exterior panels. A cloth previously used with silicone dressing can contaminate another part of the car.
Silicone residue can also hide in:
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Panel gaps
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Door handles
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Window seals
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Wheel arches
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Mirrors
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Grilles
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Door shuts
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Rubber and plastic trims
During preparation, sanding or air cleaning, this residue can be disturbed and spread into the repair area.
Why Cleaning the Car Again May Not Be Enough
Professional body shops use specialist panel wipes and surface-cleaning procedures before applying paint. However, silicone contamination can be persistent.
If a vehicle has recently been covered in silicone-rich products, the technician may need to carry out additional cleaning and preparation. Even then, contamination trapped in gaps, trims or porous materials can reappear during the painting process.
This creates unnecessary risk and can increase the amount of labour required before the repair can begin.
It Can Affect the Finish, Cost and Completion Time
A contaminated vehicle may take longer to prepare, especially when the body shop has to repeatedly inspect and clean the repair area.
If contamination causes defects after painting, parts of the job may need to be completed again. This can lead to:
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Additional preparation work
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Delays to the repair
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Extra material usage
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A higher risk of visible paint defects
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Possible additional charges
Avoiding silicone-based products before the appointment is much easier than trying to remove contamination afterwards.
What Should You Do Before Paintwork?
You do not need to present the body shop with a heavily valeted or polished vehicle.
A basic wash is normally sufficient, provided no wax, sealant, polish, tyre dressing or silicone-based product is applied afterwards. Use a straightforward car shampoo, rinse the vehicle thoroughly and allow it to dry.
Avoid applying detailing products to the car for at least several days before the repair. For larger or more sensitive paint jobs, ask the body shop how long they would prefer the vehicle to remain free from valeting products.
You should particularly avoid:
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Silicone dashboard sprays
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Aerosol trim dressings
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Tyre shine
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Spray waxes
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Ceramic detailing sprays
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Gloss-enhancing polishes
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Products described as water-repellent or long-lasting dressings
When booking the repair, tell the body shop if the vehicle has recently been professionally valeted, ceramic-coated, polished or treated with silicone products. This allows the technicians to take the necessary precautions.
Let the Body Shop Prepare the Vehicle
A professional paint repair includes careful surface preparation. The technicians will clean and degrease the relevant areas using products designed specifically for automotive refinishing.
The best way to help is to avoid adding anything that could interfere with that preparation.
A freshly valeted vehicle may look impressive when it arrives, but silicone contamination can turn a straightforward paint repair into a much more difficult job.
Before having paintwork carried out, keep the car clean—but keep it free from silicone, wax and dressing products. Your painter will thank you, and you will have a much better chance of receiving the smooth, high-quality finish you expect.
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