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you guys reccomend wet sanding to get your paint to stick. I like to use some paint thinner and a lint free cloth and rub on my body (the cars body) i avoid the windows. The thinner eats the plastic just a little, in turn roughing it up so that the paint sticks. hope this is useful

honestly i dont do any prep work other than masking unless the shell is old. i have no problems.

I don't normally either unless I've been doing some chopping, then I do that just to smooth things out.

but I will tell you this....

if you're painting on auto modellista bodies and don't plan on using their "stripes" that are originally painted on the car.
you'll have to sand those down, otherwise when you paint, no matter how thick, you'll still see remnants of the stripes as they are just slightly raised from the extra layer of paint when originally painted.
found that out the hard way.

all i can say is when mixing any pant/clearcoat always test on a junker shell.

I usually do a soap and water wash followed by a rubbing alcohol rubdown. It's less harsh and won't fog the plastic. There is some lubrication used to get the plastic to release from the mold, and if you don't wash it off it can cause trouble. I'm speaking of unpainted, clear bodies.

I do the exact same thing superfly, It makes the primer and paint stick better. The first time I painted a body, I just washed it with soap and water and never bothered to add primer. It never dried.