Dear Roy,

I have been using Plexiglas acrylic and Krylon paints, mostly their
standard indoor/outdoor gloss enamel, for over twenty years with no
incidence of what they warn you about. The Krylon solvent evaporates
extremely quickly, being touch dry in only a few minutes. Once you have
sanded down the surface with 220 wet and dry, you can first use a
Krylon primer, preferably a sandable one, or apply the Gloss directly
to the Plexiglas surface. I would guess that they are just covering
their rear ends :-)

The extruded plex, 'MC' is a lot more likely to be crazed by solvents,
but still should be okay for Krylon, but when in doubt sticl to
plexiglas 'G'. Perhaps their new fusion paint, which is supposed to be
for plastics, isn't as good as they hoped?
richard in Los Angeles.