Post by
AppleBonker »
https://forums.nicoclub.com/applebonker-u101518.html
Wed Jul 23, 2008 2:35 pm
Wow, I'm glad someone revived this thread. I just joined so I would've probably missed it otherwise. I stated in my "hello" thread that I work with automotive coatings (read: paint) and I want to correct a number of incorrect statements here. I know a lot of the information given was in good faith, but not all of it is true. Brief warning, this will probably turn into a long post.
First, your car is painted in a number of different places. My bet would be that all of the paint on your car (inside and out) was applied at no less that 20 different facilities. The main assembly plant (does the Tennessee plant manufacture all NA A/Cs?) paints the vast majority of the car (pretty much anything that is metal). What are known as Tier 1 suppliers paint the majority of everything else. My company supplies mostly paint for plastic applications (fascias - front and rear, handles, splash guards, all over the interior, etc.), so I can't speak for the body paint (most likely manufactured by DuPont or BASF but don't quote me on that) too well. Speaking from a paint manufacturer's perspective (probably makes me a bit biased), the paint is really no different from one OEM to another aside from color (the resins that actually bond together/to the car are probably nearly identical). That being said, the problem is with the application. If not enough (or too much) paint is applied, it will have a severely negative effect on the performance of the coating.
Cost: Most exterior paint is probably around $200/gallon (some colors can be significantly more) when sold in bulk. If sold to a body shop, most companies will charge significantly more (because they can). The more expensive colors are metallic reds/blues/yellows and some whites (especially tri-coats - more on this later).
Application: For body paint, I believe most colors have only 4 coats of paint. The first is an electrolytic coating (the whole metallic frame of the car is dipped in this liquid to get the coating), which is baked before moving to the next step. This helps the spray process adhere to the metal. The next coat is a primer which is conductive when it is baked. The third coating is the basecoat (which can be sprayed by anywhere from four to maybe ten robots). There is a flash (or air dry) period after this coating before the clearcoat is applied. The clear (fourth coating) is what makes the whole thing durable as well as resistant to UV and other chemicals that may come into contact with the gar (namely salt and various liquids like oil/gas/etc.). The major difference between body and plastic parts is that the plastic has no electrolytic coating (you can't apply a voltage to a plastic piece very easily). So plastic only has primer, base and clear.
Note for tri-coats: Some whites (and a few select other rare colors) are known as tri-coats. The white for the US Altima is one of these. Between the white basecoat and clearcoat application there is a mica coat. Think of mica as little pieces of ceramic prisms that diffract light to produce multiple colors. If you have the chance to look at the US white Altima, check it out in the sun. Depending on the angle at which the light is striking the car (relative to your viewing angle), the car will look different colors (either white, yellow, or a hint of red). These colors are far more difficult to match because they depend heavily on the thickness of the mica coat layer. Too much of this will make the car look like it has more color (mostly yellow), and too little will make the car look too white/plain. This is the main reason why I personally do not like these color cars. I know from experience that the color never matches well from one body part to another (just my personal opinion - not an attack on those of you with white Alti's).
All manufacturers require the parts they buy to meet certain testing requirements. Nearly all of these are the same from one brand to another (maybe just very slight differences). Once the place that makes a part proves they pass, Nissan (or whoever) will then buy parts from them. They cannot test every part they receive as this would damage the paint and make the part unusable (I doubt anyone here wants a part on their car that was tested for adhesion/acid resistance etc. - adhesion is checked by cutting a grid into the part and trying to pull paint off with tape, and I certainly don't want a crosshatch cut into my car). Knowing this, once a manufacturer has testing approvals, they probably wont paint the same way every time. This may mean that some parts have too little or too much film (as stated early causing the problems we are seeing).
As far as nature friendly paint, EVERY manufacturer that is painting in the US is basically required to go this route (thank you government). There are a number of solvents used in paint that work extremely well but are deemed too hazardous to the environment, so they are being eliminated. However, when applied correctly, this will not have a negative impact on the coating.
Ok class, this has been your intro to car paint for the day. Any questions? Seriously though, I hope this has been at least somewhat informative to those of you who manage to read through this whole post. If there are any questions, please let me know and I'll do my best to answer them.
Side note: Some of the worst things you can do to paint are spill gas or diesel on it. If you ever do, make sure to wash/rinse it off quickly to help avoid problems. On the interior, sunblock (for whatever reason) is horrible to most of those parts. Make sure you don't spill it or touch the dash (etc.) when you have put some freshly on your hands.