Description
Product Description
Why use Gtechniq C4 Permanent Trim Restorer?
C4 utilises a chemical bond to become an extension of the plastic molecule it is protecting.
The coating swaps part of its molecular structure with the surface molecules of your car’s trim. This means that you have a protective coating of unparalleled durability.
Unlike many trim products on the market, C4 is exceptionally thin (circa 30 nanometers) optically clear film – this means it will not add an unattractive gloss finish to the surface. Instead, it restores all, but the most faded trim to an ‘as new’ condition. It is ideal for new trim, helping to prevent fading.
Application Information
Simple steps to help you get the best results
- Make sure before you start you have enough product for all of your trim. For example, if you have a Mini (30ml) you would need more product than you would on a Golf (15ml)
- Work in a well-ventilated area, at a temperature above 5 degrees Celcius and out of direct sunlight. Wear the gloves provided
- Ensure the surface(s) you are going to coat are free from any contaminants.For best results clean trim with a neat solution of W5 Citrus All Purpose Cleaner, then rinse and dry. If required use a medium-stiff brush
- Ensure surfaces are completely dry and cool to the touch before applying the product.
- Soak the pad with several drops of product. Use the AP1 Lint-free Applicator supplied to spread the coating onto the surface of your trim.
- Once you have spread the product over each piece of trim, gently wipe away residue immediately with an MF1 ZeroR Microfibre Buff Cloth. If your car has heavily textured trim take time to ensure all crevices are covered, and that all residue is also removed from them
- Allow the coating to cure for 12 hours before exposing to the elements
- If opened, use within 3 months, if unopened, use within 12 months
- Store in a cool, dry place
- * Avoid direct application to rubbers and glass *
Need Help?
Frequently Asked Questions
How to restore faded plastic trim?
To restore faded plastic trim, start by thoroughly cleaning the surface to remove dirt, oils, and old dressings. Once clean and dry, apply Gtechniq C4 Permanent Trim Restorer using the applicator provided. The formula bonds with the plastic at a molecular level, reviving colour and adding long-term protection against UV rays and environmental wear.
How to permanently restore black plastic trim?
Gtechniq C4 is specifically engineered to permanently restore black plastic trim. Unlike temporary silicone-based products, it forms a chemical bond with the trim’s surface, restoring faded plastics and protecting them for up to 2 years with a single application.
How long does C4 Trim Restorer last?
C4 offers durability you can rely on. When applied correctly, it can last up to 24 months, depending on driving conditions and exposure to the elements.
Is C4 suitable for all types of plastic trim?
Yes—C4 works on most exterior unpainted plastic trims, including bumpers, mirror surrounds, window seals, and door handles. It’s ideal for textured or smooth plastic surfaces commonly found on modern vehicles.
Does C4 make trim look shiny?
No—C4 restores a natural, factory-new satin finish. It’s designed to revive the original look of your trim without adding unnecessary gloss or a greasy appearance.
Can I use C4 Trim Restorer in cold or wet weather?
C4 should be applied in dry conditions, ideally above 5°C, to ensure proper bonding. Avoid rain for at least 12 hours after application for best results.
Do I need to prep the surface before using C4?
Absolutely. Proper preparation is essential. Use an all-purpose or multipurpose cleaner to remove any remaining residues. This ensures maximum durability and performance from the product.
Will C4 work on already coated or dressed trim?
No—C4 performs best on bare plastic. If your trim has been previously treated with a silicone dressing or coating, thoroughly clean and degrease it before applying C4.
Can C4 be layered for better results?
One coat is sufficient; there is no additional benefit to applying a second coat of the product.
Is C4 safe to use on rubber or painted surfaces?
C4 is formulated for plastic trim. Avoid contact with rubber seals or paintwork. If accidental contact occurs, wipe off immediately with a clean microfibre cloth.







Great product
My Panels where really thirsty, so took 2 coats, really easy to use, fantastic results, how can such a small bottle go that far!!
Haven’t even had it yet so what should I be commenting on other than a very slow non-existent delivery? 1 Star because I probably have to, but really no stars at all.
Prompt delivery and substantial packaging