Painting over chrome plastic parts isn’t difficult, it’s just slightly different from painting over metal. Anyone can do it with a little preparation, knowledge and some patience.
Painting over chrome plastic turns parts and trim with a mirror finish into colorful parts that match or contrast against the rest of a painted machine. Proper preparation and the right paint process can yield amazing results that are pleasing to the eye.
You don’t need expensive chrome spray paint or costly paint sprayers to get good results, an aerosol spray can, and proper surface preparation will yield excellent results on any budget, once you know how. Practice on a piece of scrap, and you’ll get the hang of it quickly.
The more time you spend preparing a plastic item for chrome paint, the better the results will be and, typically, the better the results will be for cheaper paints and primers.
1. Carefully remove plastic chrome parts
Removal of plastic chrome parts and trim is recommended for best painting results and to avoid over-spray onto surrounding areas. The process is the same for non-chrome plastic parts you want to apply a chrome finish on.
If you preferred not to remove the parts you intend to paint, take the time to properly mask off surrounding areas with tape and paper.
2. Clean plastic chrome parts
After removal, clean your chrome parts to ensure proper paint adhesion. You can accomplish this with a mild soapy water solution or grease remover.
With the dirt and grime removed from your plastic chrome parts, rinse off any residue by spraying the parts with water. Mud and dirt should clean easily, what you really want to make sure you remove is any oil residue.
3. Gently scuff plastic chromed surfaces
The next step involves gently scuffing the chrome layer to be painted over. Care not to rub through this layer is needed, the goal is to prepare the surface to receive a coat of primer.
To aid in scuffing plastic chrome parts, I recommend you use water, scuffing paste and gray scuffing pads available at from your auto-parts store. A low-dollar alternative is to mix a baking powder and water solution to the consistency of toothpaste and rub it over the chromed plastic until it looks dull.
As in the previous step, when you finish scuffing the surface, take the time to rinse away any impurities and wait until the parts are completely dry. A towel, fan or sunlight and a good breeze can help dry the parts.
4. Apply an adhesion promoter
For best overall results, the first layer of spray should be an adhesion promoter. Adhesion promoters are available in aerosol can form also available at most auto-parts stores. Because of the glossy nature of chrome, even when scuffed, and the pliable nature of plastic, a thin layer of adhesion promoter, often called clear primer, is required.
Follow manufacturer recommendations and apply a thin, even coat over all chrome areas to be painted and allow sufficient dry time.
5. Apply black etching primer
10-15 minutes after applying an adhesion promoter, you can spray on a thin layer of black etching primer. This step is optional but recommended because if your chrome plastic parts sustain any chips, it’s nice to have a dark layer beneath the chip.
For best results, apply a second equally thin layer over the first layer of black etching primer to make sure the parts are completely primed.
6. Choose your paint color and type
Today’s spray paint finishing options are such that you should pick a type of paint suitable for the finish type you want. For example, if you plan to apply a clear-coat finish, some types of paint work better with specific types of finishes.
For that reason, it’s best to consider the type of paint you want with the type of finish that works best with it. I recommend a dark metallic color, often referred to as ‘black-out paint’, to give a metal-like finish and to protect it with a glossy clear-coat finish.
Follow the paint manufacturer’s recommendation for best results. 2-3 thin coats of paint will be needed and can be applied 10-15 minutes apart.
7. Protect the paint with a sealer
After all the work you’ve put in so far, you’ll want to protect the paint with a sealing clear-coat. If you were hoping for a little more shine and sparkle from the paint itself, this is where a glossy clear-coat finish shines.
Good adhesion is required so that the clear-coat doesn’t peel, so it’s best to use a paint and clear-coat combination from the same manufacturer. Additionally, it’s safe to apply a thicker layer of clear-coat than you did paint, but the drying time required will be greater, up to 45 minutes.
8. Buff and wax the finished look
When the sealing coat of paint has had sufficient time to dry and harden, which can be 2 days or more (read the paint label!), you can buff the paint with a polishing pad to remove any swirls or bumps that may have developed.
Finally, car wax is optional with some paint types, but recommended for others. I personally don’t use wax, but some swear by it, the choice is yours, and it depends on the look you’re after.
Important: Clear coat finishes can require 2-3 days to fully harden, read the instructions carefully
Tip: When it comes to most small chrome plastic parts, you can often buy a clean unfinished low-cost replacement and skip some preparation cleaning efforts.
Best Chrome Paint for Plastic
Acrylic enamel is best suited to bind over chrome plastic surfaces. Krylon, Rust-oleum and VHT (Very High Temperature) by Dupli-colour each make aerosol spray paints specifically designed for chrome on plastic applications.
Important: For best results, chrome paint for plastic must be applied on a well-prepared, clean surface free of dirt and oil.
Can you powder coat chromed plastic?
No because the plastic components typically can’t withstand the heat required for a true powder coating to work. It has been tried extensively, and warping of the plastic parts or peeling of the powder coating is typically the result.
Does etch primer work on chromed plastic?
Yes, if you follow the preparation procedures above, because chrome used over plastics differs from that used over metal. Etching primer typically doesn’t work on chrome metal parts, but it does on properly prepared chromed plastic parts.