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Primer
helps prep a model part for paint. If you've done any sanding
on the model, or any putty work, you'll have high and low spots,
and an uneven texture.
Shooting
the model part with primer allows you to sand the model with fine
sand paper to get a smooth finish layer to shoot paint on.
If
you can see an imperfection in the model part covered with primer
- you will notice it even more whan you cover it with paint.
Some
primers can even act as a filler for minor imperfections.
Fine
primer is especially designed for models, which are often a very
smale scale when compared to painting a real car or a piece of
furniture.
If
you use automotive paints, primer is usually required. Automotive
paints (or almost any paint not designed specifically for models)
can etch the plastic, sometimes even melt it. You need the primer
to help act as a barrier.
Primer
can also be useful for models that are molded in color. Shooting
a black molded model with white or gray primer can help with painting
the model a lighter color than what it was molded in.
Red
Oxide primer is good for paint colors like red or orange, or yellow.
Black
primer is good for dark colors, including black.
White
is almost good for any paint color, especially if you want to
lighten your paint color up some (for instance, when the model
is molded in a grey color as many are).
Most
modelers have their favorite primer. Once they find one they like
they tend to stick with it for years.
Model
puttys vary in the way they are made. White putty is most common,
though some are "red" (more of an orange color) and
some are green.
Some
puttys, like the Squadron Green, has model glue mixed into it,
and it helps bond to plastic by sometimes melting it some.
Again,
modelers have their favorite puttys they tend to use for years,
so it's a matter of preference.
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