Painting is sometimes so easy and sometimes so hard!
Spray Booth: There are some nice units on ebay for around $80 or so. I finally bit the bullet and just made one up with a plastic storage box, small fan and a furnace filter. You can see it on Rod Toddhunters online slot mag, page 99.
http://slotcarmods.com/summer2016.html.
I'm sure all you guys subscribe to his effort.
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Paint. I use nothing but lacquer, I've given up all enamels. Tamiya and Testors are the best. I do use Duplicolor white, black and candy lacquers. They offer candy colored lacquers in their suspension paint. Their depth and shade depends on how many coats and what color base coat you use. Here is red over a silver base.
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Chris pointed out that a coat of clear in between colors will stop any bleeding under tape. I usually remove tape after 10 minutes or so.
I do wash with dish detergent before painting and I use cheap soap that has no kind of additives, just plain dish soap. Sometimes I also use an SOS pad. Of course, I sand everything after washing. Usually I do alright, but sometimes I end up throwing the whole body in stripper and starting over. It happens.