I can believe that the effect is only temporary--the
action simply
cannot go any deeper than a few microns. All of which goes to show
that if you want a more permanent color, there's always paint. I have
equipment that's made from high-density polyurethane foam (no special
dies or forms needed for injection molding) finished with a coat of
paint that's more than 30 years old. It looks as good as the day it
was delivered.
Chuck,
I can tell you from personal experience that repainting does not work well. One, matching
the color is nearly impossible. You can get pretty darn close but not exact. Two, the
paint quality is never as good. Three, the feel is different - this one is hard to
explain: it just doesn't feel smooth and slick but rough and scratchy. I have tried
different brands of paint, gloss, non-gloss, sealant, etc to no avail. I can make it look
good especially from a few feet away but in practice you can easily tell it has been
painted.
Just my two cents.
-Ali