Recoloring you car or boat interior
If it is vinyl and your interior is in good or excellent condition, but stained or faded from the sun, you can now recolor it your self. You do not have to go to an auto trim or boat restoration shop and pay big bucks for this.

Most large automotive paint suppliers carry some sort of vinyl paint or dye, but most of these are just that, paints that will flake off or peel off over time. They are usually paints with flex agents added to them and these tend to dry out over time and are not very flexible. Find a product that is a true dye that penetrates into the vinyl, not one that just sits on the surface and you will be Ok. A true vinyl dye such as Vinylkote will not require thinning and can be used with a compressor and spray gun. If your job is small and you do not have a gun or compressor a Preval spray gun available at most Home Depots is a good solution. You may need 5 to 6 Preval guns to do the whole interior. Regular paint spray guns and compressors can be rented for a day or weekend at your local rental yard. The results with a good quality HVLP spray gun and compressor will be incredible, and you'll save a bundle over buying a complete reproduction interior kit.

Cleaning
Most automotive paint shops will carry vinyl cleaners, but I find lacquer thinner does a great job of cleaning all the grime and dirt from the surface and prepares the surface really well for recoloring. If you are not comfortable using lacquer thinners and are afraid it will melt the vinyl, which it will if you use too much then use a good degreaser or some other cleaner like Superkleen 707 to clean the surface. Use a stiff bristle paint brush to work the cleaner into the grain of the material in order to remove all skin oils, dirt or vinyl conditioners you might have applied over the years. Wipe the cleaner off with a clean damp towel. If your material is really soiled, several cleanings might be necessary. The surface of the part must be as clean as you can get it for the best adhesion and penetration of the vinyl dye. Remember to remove any emblems and metal trim pieces prior to cleaning.

When recoloring seats it is best to take the seats apart so that you can get into every nook and cranny. This is important because if the surface is not cleaned well then the color will lift and not bond to the surface the way it should. Make sure the surface is completely dry prior to recoloring.

Spraying Color
Make sure the vinyl dye has been properly shaken before pouring it into the paint cup as pigments in the dye tend to settle at the bottom if not stirred frequently. For best results, the temperature should be between 60-85 degrees. Spray from about 6 to 8 inches away if using Vinylkote and 12 to 14 inches if using some other dye. Regulate the air pressure to about 25 psi and spray in light mist coats. Spray in several light coats in a smooth back-and-forth motion. Allow 10 minutes between coats. This is called the "flash off" period. Do not try to achieve full coverage in 1 coat as several light coats gives the dye a chance to penetrate into the vinyl and bond properly instead of just sitting on the surface like paint. If you're changing color, it will take a few more coats, which means more dye. Consult with your supplier on how much dye you will need to do your complete interior. To do an average interior with Vinylkote you will need 1 quart if you just want to refresh the color and 2 quarts if you want to change the color completely. If using some other dye please note you will need at least 2 quarts for refreshing the color and 3 to 4 quarts if changing color completely. Spray in a well-ventilated area and wear a particle mask for safety

Hard Plastic
First sand the hard plastic down with 600 wet and dry sandpaper. Then clean the hard plastic in the same way as you did the vinyl. Unlike the soft material on the seats, once you have cleaned the surface you can wash off the cleaner with the hose. Again, let the panels dry completely. Some of the plastics used today are made out of polypropylene, TPO or EPDM, which are very difficult to color. You may need an adhesion promoter for these kinds of hard plastics. This should be sprayed on hard plastic surfaces prior to the color. One light coat of the adhesion promoter is usually sufficient. This helps the dye bond to the plastic much better and makes it more durable.

The final results will be stunning when compared to the former condition, and the cost will be minimal. If you don't mind doing the restoration work yourself, it's the only way to go. Plus, you can tell everyone that you did it your self and that it looks exactly like the original the did it rolled off the assembly line.