Wednesday, April 28, 2010

2 Tone Powder Coating?

A friend and i are thinking about powder coating some engine parts and our rims. we are about to buy all of the supplies including the sandblaster, hot coat powder coating gun, powder and anything else we need. but my question is when we start to do our valve covers on our cars we want to do a 2 tone job. for example we would want the valve cover to be white and the the nissan logo and name to be red. how would we go about doing that? or another example if i wanted my rims to be mirror black but i wanted the lips of the rims to be chrome.2 Tone Powder Coating?
A few things to consider from the coatings performance point of view:





-The valve covers get hot and are exposed to petroleum distillates. Be very sure you get the right powder product and prepare the surfaces correctly or, your paint job will last less than a few hours. Even so, White colors yellow terribly with heat. Expect to be disapointed.





-wheels. This is my specialty. I am inthis industry supplying coatings to OEM and aftermarket wheel guys. Wheel painting is a tedious process. I assume your rims are aluminum. Painting aluminum requires a multistep pretreatment process to get good adhesion. Then a good powder coating for corrosion and durability. Then painting and a good clear coat. The paint is usually baked 30 minutes at 150 Celsius to get good cure and performance. Any air dry coating you might consider will last all of a few months. Chroming and painting are different processes and do not blend well. I applaud you for being creative, but your plan is a tough one to achieve with any long term durability. Good luck. Hope it looks great.2 Tone Powder Coating?
Here's a discussion on a powder coating forum:





http://forum.caswellplating.com/powder-c鈥?/a>





Basically, they came up with two methods: First would be to go all one color, bake it, mask off what you don't want to coat with the second color (like a stencil), remove the masking, and bake it again.





The second method would be to mask off what you don't want one color, spray it, bake it until it's half cured, let it cool, mask off the other color, spray it again, remove the masking, and do a complete curing bake.





I would test out these methods on scrap first. But, they seem reasonable.

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