This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.
From: firstname.lastname@example.org (LarryC)
Future floor polish (it isn't wax) doesn't yellow. I find it useful for
1) It must be used over some kind of paint or over acrylic gesso. If it
seeps into cardboard or wood, the material will become brittle;
2) It will cause dope and (even permanent) Magic Marker color to run.
This effect can be used to advantage, but it can also ruin a model if
it's unexpected. Future does not cause enamel paint to run, and may
certainly be used to cover decals. Don't know if the decal will yellow
beneath the coating.
3) A glossy finish is not always desirable, and Future yields only a
glossy finish. Art stores sell equivalent mixtures that come in gloss
or matte finishes. The are called "Acrylic Gloss Medium," and "Acrylic
Matte Medium," respectively. They are thicker than Future, but they can
be thinned with water.
4) Acrylic colors, available in art stores, can be used on rockets, as
long as acrylic gesso is laid down first. The colors should be thinned
with water or Future. Acrylic paints are normally labeled to tell you
how opaque they are and how toxic they are. Both qualities vary from
color to color. Even though the tubes seem expensive, the opaque colors
have excellent covering power and they turn out to be very good buys.
5) From my own experience, commercial acrylic model paints are to be
avoided. They are over-thinned, and they yield undesirable, cracked
From: email@example.com (Bob Kaplow)
Try adding a small amount of BLUE to the white paint (a few drops per
bottle). The faint blue tint hides the yellowing, much like bluing in
the white laundry.